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  • International Union of Crystallography (IUCr)  (1.316)
  • 1990-1994
  • 1980-1984  (1.316)
  • 1945-1949
  • 1930-1934
  • 1925-1929
  • 1980  (1.316)
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Verlag/Herausgeber
Erscheinungszeitraum
  • 1990-1994
  • 1980-1984  (1.316)
  • 1945-1949
  • 1930-1934
  • 1925-1929
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Phases, lattice parameters and thermal expansion of (GaxIn1−x)2Se3, 1≥x≥0, between room temperature and melting point (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 24-30 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The phases, their lattice parameters and the linear coefficient of the lattice thermal expansion were determined by high-temperature X-ray diffraction between room temperature and the melting point for the system (GaxIn1 − x)2Se3 (1 ≥ x ≥ 0). A wide homogeneity range of zinc blende structure was found in the Ga-rich region when a certain critical temperature was reached. In the In-rich region the alloys were isostructural with γ-In2Se3 at all temperatures, and the linear thermal-expansion coefficient was composition dependent.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011454
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  • 2
    Digitale Medien
    Digitale Medien
    X-ray Bragg reflexion and strain compensation in silicon crystals (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 31-33 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Crystal-lattice strain induced by impurity doping may be compensated for by diffusion of another kind of impurity. This was tried with successive diffusion of germanium and boron into (111) silicon wafers and was confirmed in a nondestructive way from the intensity profiles of the 333 Bragg reflection of Cu Kα X-rays. The intensity profile is related to the strain distribution along the depth through numerical computations, the programme for which has been developed and utilized previously [Fukuhara & Takano (1977). Acta Cryst. A33, 137–142] in quantitative discussions on strain and impurity concentration in silicon.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011466
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  • 3
    Digitale Medien
    Digitale Medien
    The determination of diffuse-boundary thicknesses of polymers by small-angle X-ray scattering (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 34-45 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Thermal density fluctuations within phases and finite interphase widths lead to systematic deviations from Porod's law. The validity of present methods used to analyze these deviations and determine diffuse-boundary widths is determined. In view of the inadequacies found in these methods, a simple yet accurate method is proposed to determine the diffuse-boundary width from direct graphical analysis of slit-smeared intensity data. The diffuse interface is modelled by a sigmoidal-gradient model which is justified on thermodynamic grounds, with the interphase thickness as a function of the Flory–Huggins interaction parameter.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011478
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  • 4
    Digitale Medien
    Digitale Medien
    A miniature piston-cylinder apparatus for high-pressure X-ray diffraction in conjunction with energy dispersion (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 46-49 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A miniature piston-cylinder high-pressure cell has been constructed for experiments with energy-dispersive X-ray diffraction. The maximum pressure achieved was 37 × 108 Pa. Examples are given for KCl and MgO, both measured with NaCl as an internal standard. The phase transition in KCl has been observed and the CsCl structure type verified.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S002188988001148X
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  • 5
    Digitale Medien
    Digitale Medien
    Etude des défauts des croissance dans des monocristaux naturels de quartz (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 50-57 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Defects are studied in natural quartz crystals by X-ray diffraction topography with a Lang camera. Dislocations, precipitates and band growths revealed by X-ray studies are also characterized by other methods such as optical microscopy and thermoluminescence. Finally, a model of growth is proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011491
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  • 6
    Digitale Medien
    Digitale Medien
    Theoretical considerations of extra equal-thickness fringes around a dislocation outcrop observed with an X-ray plane wave (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 58-64 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: An analytical interpretation is presented of extra half-line equal-thickness fringes observed at a dislocation outcrop in X-ray and electron micrographs of wedge-shaped crystals taken at off-Bragg conditions. Extra fringes arc well explained as the interference of two wavefields deduced from Takagi's equations for dynamical diffraction in distorted crystals. Theoretical discussions given in the present paper confirm the experimentally obtained rule of Δn = h. b (h is the diffracting vector and b the Burgers vector of a dislocation), which determines the extra number of fringes, Δn, at the dislocation outcrop. When h. b ≠ integer, it is predicted that a discontinuous shift will occur in the position of equal-thickness fringes along the topographic image of a dislocation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011508
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  • 7
    Digitale Medien
    Digitale Medien
    Preparation and X-ray powder diffraction studies of triple orthovanadates having langbeinite structure (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 450-451 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Triple orthovanadates MIBaCr2(VO4)3 (where MI = Li, Na or Ag) are synthesised by solid-state reaction. These compounds are found to have orthorhombically distorted langbeinite structure. The crystallographic parameters of these compounds for an orthorhombic cell with P212121 as the space group and containing four formulae per unit cell are reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012514
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  • 8
    Digitale Medien
    Digitale Medien
    Données cristallographiques sur les thiocyanates de tris(éthylènediamine)rhodium(III) actif, racémique et racémique actif (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 452-453 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: (±)Rh(en)3(SCN)3 and (+)Rh(en)3(SCN)3, Rh(C2H8N2)3.(SCN)3, C6H24N6Rh.C3N3S3, crystallize in orthorhombic cells. The lattice constants are respectively a = 14.652 (5), b = 14.268 (6), c = 17.480 (6) Å and a = 14.711 (4), b = 13.481 (3), c = 9.166 (2) Å. They are isomorphic with their homologues (±)Co(en)3(SCN)3 and (−)Cr(en)3(SCN)3. The active racemate [(+)Rh(en)3(+)Cr(en)3](SCN)6 is isomorphic with the monoclinic form of [(+)Co(en)3(−)Cr(en)3](SCN)6. Its lattice constants are a = 15.707 (5), b = 17.739 (4), c = 9.426 (3) Å and γ = 131.04 (2)°.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012526
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  • 9
    Digitale Medien
    Digitale Medien
    An X-ray diffraction study of the system Al2Se3In2Se3 in the In-rich region (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 454-458 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A series of samples in the system Al2Se3–In2Se3 in the In-rich region have been synthesized and studied by X-ray diffraction. In the interval of the Al/In (molar) ratio r from r≳ 1/50 to r≲ 1/20 the system has a two-phase region, α + γ1, where α is isostructural with the room-temperature modification of In2Se3, and γ1 is isostructural with the second high-temperature modification, γ, of In2Se3. For r ≳ 1/20, ternary γ1 alloys (AlxIn1−x)2Se3 are present alone and their unit-cell parameters decrease continuously as the Al content increases. These results are analogous with those obtained for the system Ga2Se3–In2Se3 in the In-rich region. The samples have also been studied by differential thermal analysis and electron-probe microanalysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012538
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  • 10
    Digitale Medien
    Digitale Medien
    Advances in X-ray analysis. Vol. 22 edited by G. J. McCarthy, C. S. Barrett, D. E. Leyden, J. B. Newkirk and C. O. Ruud (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 462-463 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012587
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  • 11
    Digitale Medien
    Digitale Medien
    Industrial crystallization 78 edited by E. J. De Jong and S. J. Jancic (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 463-463 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012599
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  • 12
    Digitale Medien
    Digitale Medien
    Calcul du Profil des bandes de diffraction produites par des empilements de feuillets de nature différente (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 148-153 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Until now, the calculation of intensities diffracted by layer structures has only been treated in the two extreme cases, namely (i) the layers interfere completely and (ii) the layers do not interfere (turbostratic structures). The present paper develops the mathematical treatment which allows the calculation in the intermediate case, namely when layers are only partially interfering.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011764
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  • 13
    Digitale Medien
    Digitale Medien
    Crystal data for new rare-earth thallates MIIITiIIIO3(M=La,Nd) (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 613-613 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Powder X-ray diffraction data for two new rare-earth thallates, MIIITlIIIO3 (M = La, Nd), have been reported. These thallates have been prepared using two chemical routes by heating homogeneous 1:1 molar reaction mixtures of (a) rare-earth carbonates, MIII2 (CO3)3.nH2O, and thallous carbonate, Tl2CO3, and (b) rare-earth oxides, MIII2O3, and thallous carbonate, in air at 823±10 K for 7 h.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012897
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  • 14
    Digitale Medien
    Digitale Medien
    Crystal data for three new ammonium potassium pyrophosphates (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 614-615 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Unit-cell parameters and space groups have been determined for three ammonium potassium pyrophosphates. The compound (NH4, K)2H2P2O7 is triclinic with space group P1 or \overline P1, and a = 7.950 (3), b = 7.270 (3), c = 7.184 (3) Å, α = 90.89 (4), β = 117.61 (3), γ = 81.56 (4)°, Z = 2. The hydrated salt (NH4, K)2H2P2O7.0.5H2O is orthorhombic with space group Pnma or Pna21, and a = 19.22 (2), b = 7.64 (1), c = 10.39 (1) Å, Z = 8. The tribasic salt (NH4, K)3HP2O7.H2O is monoclinic with space group Cc or C2/c. The X-ray data show that a = 19.41 (2), b = 6.158 (6), c = 16.90 (2) Å, β = 107.5 (1)°, Z = 8. The indexed powder diffraction patterns are given for the three salts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012903
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  • 15
    Digitale Medien
    Digitale Medien
    Small-angle X-ray scattering from solutions of flow-oriented colloidal particles (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 154-162 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The amount of information which can be obtained from a small-angle X-ray experiment can be considerably increased by orienting the solute particles with external forces during the scattering experiment. In this paper it is shown that orientation by flow, for instance through a capillary tube, gives additional information about size, shape, flexibility and rotational diffusion of the particles. The only requirement, in order to obtain flow-oriented samples, is that the solute particles must be relatively large and asymmetric. On the other hand, if the scattering curve is dependent on the flow rate through the capillary, it can immediately be concluded that the solute particles are asymmetric (or they are deformed in the hydrodynamic field). Equations describing the relationship between flow rate, molecular shape and scattered intensity are given, and theoretical intensity patterns for some representative cases are presented. It follows that there is a fundamental difference in scattering patterns for oblate and prolate ellipsoids of revolution. This difference can be used to differentiate between these two cases. Some experimental results obtained using inorganic model colloids are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011776
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  • 16
    Digitale Medien
    Digitale Medien
    Optical transforms of disordered molecular crystals (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 244-251 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: An Optronics P-1700 film-writing device is used to produce simulations of disordered organic molecular crystals. The simulations may be used directly to obtain optical diffraction patterns for comparison with X-ray diffuse scattering photographs of real crystals. Examples of some substituted anthracenes are given to demonstrate the diversity of disorder effects which may be included and the level of precision achieved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012009
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  • 17
    Digitale Medien
    Digitale Medien
    The asymmetrically cut Bonse–Hart X-ray diffractometer. II. Comparison with the Kratky camera (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 256-258 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The asymmetrically cut, optimized BH diffractometer for small-angle X-ray scattering experiments is compared with the Kratky camera. It is shown that a crossover point exists in the resolution so that at a lower resolution the Kratky camera is superior and at a higher resolution the BH system is preferable. The crossover point depends on the number of reflections used. Methods of reducing the spurious signal and increasing the S/N ratio of the BH system are also discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012022
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  • 18
    Digitale Medien
    Digitale Medien
    Precipitation and ordering in calcia- and yttria-stabilized zirconia (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 375-379 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Single crystals of ZrO2–15 mol % CaO and ZrO2–9 mol % Y2O3, annealed for either 400 h at 1273 K or 2.5 h at 1673 K and then quenched, were examined by electron diffraction and dark-field transmission electron microscopy. The thermal treatments duplicated those of Faber, Mueller & Cooper [Phys. Rev. B (1978), 17, 4884–4888], who used elastic neutron scattering to investigate fluorite-forbidden reflections which arise from what previous authors have called the `ordered' structure. The present results show that the extra reflections are due to precipitation of tetragonal ZrO2 in both systems. Imaging with the diffuse-scattered intensity also present reveals small domains, presumably associated with oxygen-vacancy ordering, in the cubic solid-solution matrix. The diffuse intensity is observed whether or not tetragonal ZrO2 precipitates are present.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012332
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  • 19
    Digitale Medien
    Digitale Medien
    Multiple twinning in Co(C15H11OS)3 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 397-398 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Crystals of tris(3-mercapto-1,3-diphenyl-2-propen-1-onato)cobalt(III), Co(C15H11OS)3, C45H33CoO3S3, are monoclinic, P21/a, a = 19.33, b = 11.02, c = 18.13 Å, all ±0.3%, β = 93°0′±15′; Dobs = 1.346 (5) Mg m−3 at 293 K giving Z = 4 and Dx = 1.338 Mg m−3. Multiple twinning results from fortuitous pseudo-orthorhombic and pseudo-hexagonal (a/b ∼√3) twin-lattice symmetry around c[001].
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012381
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  • 20
    Digitale Medien
    Digitale Medien
    Revised crystal data of BaZnGeO4 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 400-401 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Transparent and colourless single crystals of BaZnGeO4 were grown by the Czochralski pulling method. Chemical analysis showed that the crystal composition was very close to stoichiometry. The unit cell is hexagonal with a = 9.297 (1) and c = 35.284 (2) Å. These are √3 and 4 times larger for a and c, respectively, than the already reported ones. D293 is 5.144 and Dx is 5.140 Mg m−3 for Z = 24. The most probable space group is P63. Indexed powder data and some physical properties are given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S002188988001240X
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  • 21
    Digitale Medien
    Digitale Medien
    The measurement of the X-ray scattering factors of silicon from the fine structure of Laue-case rocking curves (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 410-416 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Laue-case rocking curves of a pair of crystals with nearly equal thickness display a detailed fine structure which is shown to be very suited to the determination of precise values of the atomic scattering factor fg. Preliminary data thus obtained are f440 (AgKα) = 5.377 (15) and f440 (Mo Kα) = 5.402 (18) for silicon at 293 K. They agree well with the more precise data obtained in the past with the Pendellösung method using wedge-shaped crystals [Aldred & Hart (1973). Proc. R. Soc. London Ser. A, 332, 223–238]. The strength and the advantages of the new method are discussed. With proper optimization the rocking-curve method is assumed to measure fg values with errors less than 0.1%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012460
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  • 22
    Digitale Medien
    Digitale Medien
    Crystallographers (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 462-462 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012575
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  • 23
    Digitale Medien
    Digitale Medien
    Scanning electron microscopy/1979. Parts I and II edited by O. Johari (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 463-464 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012605
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  • 24
    Digitale Medien
    Digitale Medien
    Optimization of quantitative X-ray diffraction analysis (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 479-485 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Very little emphasis is generally given to the reliability of the concentrations obtained by the methods of X-ray diffraction phase analysis. Thus the statistical accuracy of the results is not or only vaguely known. The related optimization problem of choosing the precision of measurement of the diffraction peaks in such a manner that the concentrations of required accuracy be obtained in a minimum time is unsolved in the literature. Owing to the lack of this optimization, the time spent on the diffraction measurements is usually much larger than the accuracy of the results would substantiate. The optimization is elaborated in the present paper. The resulting procedure to be followed is conceptually simple and of general applicability. A computer program has been developed for carrying out all calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012630
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  • 25
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    Digitale Medien
    Détermination précise de la composition de couches epitaxiées Ga1−xInxP (0≤x≤0,10) (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 513-515 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The chemical composition of Ga1−xInxP (0 ≤ x ≤ 0.10) alloys epitaxically grown on GaP substrates has been determined by electron microprobe analysis and by lattice-parameter measurement (a). The a(x) calibration curve follows Vegard's law which confirms the regular character of the solid solution and the existence of strain relaxation in the epitaxic layers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S002188988001268X
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  • 26
    Digitale Medien
    Digitale Medien
    Report of the Executive Committee for 1979 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 635-635 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880013015
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  • 27
    Digitale Medien
    Digitale Medien
    Current topics in materials science. Vol. 3 edited by E. Kaldis (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 636-637 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880013040
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  • 28
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    Digitale Medien
    Symposium on Crystallographic Studies Using Energy-Dispersive Diffraction, American Crystallographic Association, Boston University, Boston, Massachusetts, USA, 12–17 August 1979 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 340-341 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012228
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  • 29
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    Digitale Medien
    Phase transitions in ammonium nitrate (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 403-409 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The phases of ammonium nitrate, NH4NO3, doped with small amounts of NiO or CuO have been studied by X-ray and neutron diffraction at various temperatures from 80 to 423 K. NH4NO3 with metal-oxide additives, which are believed to form complexes, exists as a solid solution. Phase IV is stable down to 140 K in the NiO-doped samples and 210 K in the CuO-doped sample. The thermal expansion of this phase is extremely anisotropic, with the b axis expanding rapidly with increasing temperature while the a axis contracts slightly. At higher temperatures the doped samples transform directly from phase IV to phase II, bypassing phase III, starting at about 328 K. The structure of phase II, which is disordered, was refined in the space group P4/mbm. The structure of phase III contains hydrogen-bonded chains parallel to the b axis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012459
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  • 30
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    Digitale Medien
    A white-X-ray four-circle diffractometer (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 433-437 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A white-X-ray (Bremsstrahlung) four-circle diffractometer with a solid-state detector [Si(Li)] has been constructed. The system is operated by a small computer with magnetic disk memories, and enables energy-dispersive intensity measurements to be carried out with the X-rays selected from white X-rays. The present paper describes (1) how the present system can be used for energy-dispersive diffractometry even with the white radiation from a standard X-ray tube, and (2) how this system allows the measurement of the integrated intensities with almost the same accuracy as in angle-dispersive diffractometry with characteristic X-rays.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012496
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  • 31
    Digitale Medien
    Digitale Medien
    EDINP, the Edinburgh powder profile refinement program (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 630-633 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A powder profile refinement program written specifically for the easy application of structural constraints is made generally available. It is based on ORFLS and written in Fortran IV. Details of the philosophy of the program are outlined, with emphasis on the areas where more research is necessary. Examples of usage in the literature are cited.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012964
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  • 32
    Digitale Medien
    Digitale Medien
    10,10-Divanillyl-9(10H)-anthracenone (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3199-3201 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011302
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  • 33
    Digitale Medien
    Digitale Medien
    Lattice constants of the compounds Sr2LnAlO5 and Sr2LnFeO5 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3208-3209 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S056774088001134X
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  • 34
    Digitale Medien
    Digitale Medien
    Refinement of the Y2O3 structure at 77 K (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3209-3211 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011351
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  • 35
    Digitale Medien
    Digitale Medien
    [(1RS,2RS,3SR)-3-Hydroxy-2-methylcyclopentyl]trimethylammonium chloride (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3206-3208 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011338
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  • 36
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    Digitale Medien
    The crystal structures of nine K feldspars from the Adamello Massif (Northern Italy): erratum (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3211-3211 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011363
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  • 37
    Digitale Medien
    Digitale Medien
    Structure Reports (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3211-3211 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011375
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  • 38
    Digitale Medien
    Digitale Medien
    Molecular Structures and Dimensions (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3212-3212 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011387
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  • 39
    Digitale Medien
    Digitale Medien
    Co-editors of Acta Crystallographica (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3212-3212 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011399
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  • 40
    Digitale Medien
    Digitale Medien
    Report of the Executive Committee for 1979 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3212-3212 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011405
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  • 41
    Digitale Medien
    Digitale Medien
    (−)-2(R)-[2,3-Dihydro-2(R)-isopropyl-4-oxo-4H-1-benzopyran-6-yl]-N-[1(R)-phenylethyl]propionamide: a chromanone amide with three chiral centres (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3193-3196 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011284
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  • 42
    Digitale Medien
    Digitale Medien
    SQ 14,225: 1-(D-3-mercapto-2-methylpropionyl)-L-proline (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3196-3199 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011296
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  • 43
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    Digitale Medien
    The structure of 2-(5'-chloro-2'-hydroxybenzoyl)benzoic acid (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3201-3203 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011314
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  • 44
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    Digitale Medien
    2'-Acetamido-2-chloro-4'-diethylamino-4-mesylazobenzene and 2-chloro-4'-diethylamino-4-mesyl-2'-propionamidoazobenzene (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 3203-3206 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740880011326
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  • 45
    Digitale Medien
    Digitale Medien
    A strategy for collecting isomorphous derivative data with the oscillation method (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 304-305 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A strategy is described for the collection of isomorphous derivative data using the oscillation method. An example of this procedure is given using the uranyl derivative of southern bean mosaic virus. The method is based on rapid collection and processing of an initial low-resolution (large oscillation angle) data set which is used to characterize the derivative before proceeding to high-resolution (small oscillation angle) photography.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012101
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  • 46
    Digitale Medien
    Digitale Medien
    Crystal data and structural relation between Pb6GeO8.Pb11Ge3O17 and PbO (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 307-310 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Transparent yellow-greenish single crystals of Pb6GeO8 were obtained by spontaneous crystallization from a melt with a molar ratio of PbO:GeO2 = 4.7:1. The compound is monoclinic, probable space group P21/a, a = 52.665 (12), b = 15.063 (4), c = 23.949 (6) Å and β = 111.03 (5)°; Dm(293 K) = 8.65 (3), Dx = 8.653 Mg m−3 for Z = 64 formula units. Pb11Ge3O17 was synthesized by sintering high-purity oxides PbO and GeO2 of molar ratio 3.69:1 at 990 K. The compound is also monoclinic, probable space groups C2/c or Cc, a = 25.117 (5), b = 15.440 (2), c = 45.529 (13) Å and β = 103.20 (4)°; Dm(293 K) = 8.55 (2), Dx = 8.560 Mg m−3 for Z = 32.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012125
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  • 47
    Digitale Medien
    Digitale Medien
    Crystal data for AgGaxIn1−xSe2 and CuGaxIn1−xSe2 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 311-315 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Series of chalcopyrite-type solid solutions AgGaxIn1−xSe2 and CuGaxIn1−xSe2, 0≤x≤1, have been prepared by direct synthesis from the melt. The space group is I\bar 42d (No. 122), Z = 4. The unit-cell parameters a and c and the ratio c/a change linearly with x. Powder data at 298 K are given for AgGaSe2, AgGa0.80In0.20Se2, AgGa0.70In0.30Se2, AgGa0.40In0.60Se2, AgGa0.20In0.80Se2 and AgInSe2, and for CuGaSe2, CuGa0.60In0.40Se2, CuGa0.30In0.70Se2 and CuInSe2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012149
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  • 48
    Digitale Medien
    Digitale Medien
    Commission on Crystallographic Apparatus. Microdensitometer Project report I. Inter-Experimental Agreement (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 318-337 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012174
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  • 49
    Digitale Medien
    Digitale Medien
    Longer filament lifetimes for rotating-anode X-ray machines using a beam-deflecting magnet (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 338-339 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: If the length of the focal spot is increased while the width remains constant, X-ray output can be increased without changing the specific loading on the anode.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012198
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  • 50
    Digitale Medien
    Digitale Medien
    A method of calibrating powder-camera films (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 339-340 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: When the accurate determination of inter-planar spacings from a standard Debye–Scherrer powder-camera film is required for unit-cell dimension and indexing purposes, then several corrections have to be applied to the measured arc dimensions before the required precision can be achieved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012204
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  • 51
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    Digitale Medien
    Higher-order structural relationships between hematite and magnetite (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 346-353 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Matrix-transformation techniques are developed to describe the numerous higher-order orientation relationships possible between hematite and magnetite when multiple twinning of both phases is allowed. Structural models for the various interfaces are described. The matrices are used to predict the peak positions expected for the 400M pole figure of magnetite on hematite. Comparison with the experimental pole figure [Becker, Heizmann & Baro (1977). J. Appl. Cryst. 10, 77–78] showed that it was also necessary to allow for oriented recrystallization of hematite. This involves a new distinct type of orientation relationship which is labelled transformation twinning.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012277
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  • 52
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    Digitale Medien
    New methods of X-ray diffraction spectrometry. II. Principle and performance of a novel type of curved-crystal spectrometer (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 359-363 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The construction principles for a flexible X-ray spectrometer which can be equipped either with a single curved crystal or with two curved crystals are described. A few of the theoretical 4 + 32 possible working modes are selected for a closer investigation and examples of recorded spectra are given. It is shown in the general single-crystal case that for a wavelength close to a cut-off energy the narrow diffraction cone has an elliptic section, as predicted by the theory. The spectrometer is discussed in terms of intensity, resolution and dispersive power. A comparison with other types of spectrometer is made.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012290
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  • 53
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    Digitale Medien
    Calculation of the X-ray powder reflection profiles of very small needle-like crystals. I. Principles of the method (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 370-374 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The aim of this paper is to develop a calculation method which allows the theoretical profiles of X-ray powder reflections to be obtained in the case of very small needle-like crystallites. This method takes into account not only the shape transform of the crystallite but also the variation of the structure factor. The study is limited to the case where the cross section of the needles contains two of the principal crystallographic axes and the third axis is along the crystallite direction of elongation. An example of the application of this method is given for a microcrystallized fibrous silicate known as sepiolite.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012320
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  • 54
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    Digitale Medien
    The 2θ determination of diffraction peaks from `poor' powder samples. Application to biological apatite (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 380-384 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A method is presented for improving the accuracy of the determination of peak positions from step-scanned X-ray powder diffraction data. This method is intended to be used in situations where the nature of the sample produces broad asymmetric peaks with a low peak-to-background ratio. A Fourier series is fitted to the experimental step-scan observations and the peak position is calculated from this functional representation. The method has been tried on the mineral apatite from biological sources, mainly bone, where ionic substitutions affect the cell parameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012344
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  • 55
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    Digitale Medien
    Notes and News (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 401-401 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012423
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  • 56
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    Digitale Medien
    Crystal growth bibliography. Solid state physices literature guides, Vol 10 edited by A. M. Keesee, T. F. Connolly and G. C. Battle Jr (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 402-402 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012447
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  • 57
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    Digitale Medien
    Crystal subgrain misorientations observed by X-ray topography in reflection (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 417-424 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Based on the principles of conservation of momentum and energy for X-ray diffraction, a vector description is obtained for the displacement of adjacent subgrain images in reflection topographs. The analysis includes, in addition to those crystal parameters defining the misorientation at a subgrain boundary, the combined effects of (horizontal and vertical) divergence in the incident X-ray beam and of the position where the X-ray images are recorded. The vector description is matched with a stereographic projection method of analysis for describing the subgrain misorientations. These total considerations are applied to the characterization of subgrain boundaries grown into a nickel single-crystal solidified along [010], including specification of the dislocation structure within the boundaries.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012472
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  • 58
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    Digitale Medien
    A computer-controlled slit unit for the PW1100 diffractometer (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 105-105 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011624
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  • 59
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    Digitale Medien
    LSD: a Fortran software for mini-computers to control a four-circle neutron diffractometer for single crystals (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 101-104 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The paper describes a program system, written in Fortran, designed to control an automatic four-circle diffractometer for neutrons, either with or without an analyser. A simplified version can be used to control a powder diffractometer. This system, initially developed on the Télémécanique T2000 computer for three diffractometers at the Institut Laue–Langevin at Grenoble, has been rewritten for the Digital Equipment Corporation (DEC) PDPI1 computer in such a way as to make the best possible use of the supervisor and the facilities available on this system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011612
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  • 60
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    Digitale Medien
    Donation (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 106-106 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011648
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  • 61
    Digitale Medien
    Digitale Medien
    Crystallographers (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 106-106 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S002188988001165X
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  • 62
    Digitale Medien
    Digitale Medien
    Current topics in materials sceince. Vol. 1 edited by E. Kaldis (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 107-107 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011685
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  • 63
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    Digitale Medien
    Diffraction and imaging techniques in material science edited by S. Amelinckx, R. Gevers and J. Van Landuyt (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 107-108 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011697
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  • 64
    Digitale Medien
    Digitale Medien
    CALPHAD: Computer Coupling of Phase Diagrams edited by L. Kaufman (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 108-108 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011703
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  • 65
    Digitale Medien
    Digitale Medien
    The study of the structure of grain boundaries using diffraction techniques (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 109-127 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The development and use of electron and X-ray diffraction techniques to study the structure of grain boundaries in crystalline materials is reviewed. The fundamental questions that need to be answered about the structure of boundaries are discussed. The scattering expected from a small-angle twist boundary is calculated and shown to be in good agreement with electron and X-ray diffraction observations. The recent results from X-ray studies on large-angle twist and tilt boundaries in specially prepared Au bicrystals are examined and used to illustrate the type of information that diffraction techniques can provide on the detailed atomic structure of grain boundaries. It is also shown that electron diffraction can be used to examine the structure of grain boundaries of polycrystalline specimens.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011715
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  • 66
    Digitale Medien
    Digitale Medien
    A goniometer for the measurement of stresses in single crystals and coarse-grained specimens (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 128-131 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A &psgr;-φ goniometer with two axes of rotation, driven by stepping motors, was designed as an attachment for a horizontal &thgr;/2&thgr; goniometer. By means of this arrangement it is possible to measure strains and compute stresses in single crystals and in separate crystals of a bicrystal or a coarse-grained polycrystalline specimen. The available rotations also make it possible to investigate residual macrostresses and textures in polycrystalline specimens. Results of the test measurements on a tensile specimen of a molybdenum single-crystal are given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011727
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  • 67
    Digitale Medien
    Digitale Medien
    The correlation function, intersect distribution and scattering from a cube (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 132-134 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A calculation of γ(r), the correlation function which gives the X-ray scattering of a cubic object of uniform density, is given for the full range of r. A new method, which can be applied to other systems, is used. The function γ(r) and its first derivative are everywhere continuous, but γ′′(r) is discontinuous at r = L and r = L□2 (L = cube edge length). This leads to an intersect distribution of unexpected shape. The scattering intensity as a function of angle is calculated by Fourier inversion of γ(r).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011739
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  • 68
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    Digitale Medien
    Experimental separation of the coherent component of X-ray scattering prior to RDF analysis of non-crystalline polymers (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 135-140 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: An experimental method is described which enables the inelastically scattered X-ray component to be removed from diffractometer data prior to radial density function analysis. At each scattering angle an energy spectrum is generated from a Si(Li) detector combined with a multi-channel analyser from which the coherently scattered component is separated. The data obtained from organic polymers has an improved signal/noise ratio at high values of scattering angle, and a commensurate enhancement of resolution of the RDF at low r is demonstrated for the case of PMMA (ICI `Perspex'). The method obviates the need for the complicated correction for multiple scattering.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011740
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  • 69
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    Digitale Medien
    Absolute atomic arrangement and spontaneous polarization in ferroelectric LiH3(SeO3)2 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 176-179 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The sense of the spontaneous polarization Ps for ferroelectric LiH3(SeO3)2 has been related to the absolute atomic arrangement with the use of anomalous scattering of neutrons from 6Li. The polar axis is almost parallel to the crystallographic c* axis. The absolute sense of Ps is antiparallel to c* with an experimentally determined magnitude of 15 × 10−2 C m−2. The calculated value, assuming point charges for Li+, H+, Se4+ and O2− is −9.8 x 10−2 C m−2. LiH3(SeO3)2 belongs to the three-dimensional class of ferroelectrics with essentially random displacement directions of the atoms at polarity reversal. The large value of Ps is the result of the oxygen displacements all having the same sense along the polar axis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011806
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  • 70
    Digitale Medien
    Digitale Medien
    Crystal data for barium methanesulphonate Ba(CH3SO3)2 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 190-190 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The title compound crystallizes in the orthorhombic system (possible space groups: C2cm, Cmcm and Cmc21). The unit-cell data are a = 6.313 (5), b = 16.60 (2), c =7.555 (3) Å. The indexed powder data is given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011831
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  • 71
    Digitale Medien
    Digitale Medien
    A high-resolution section topograph technique applicable to synchrotron radiation sources (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 180-187 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Asymmetric Bragg reflection from the surface of a plane crystal monochromator is employed to provide the spatially narrow beam (width less than 10 μm) required for high resolution in X-ray section topographs. Details are given of apparatus in which the monochromator is traversed back and forth to even out local irregularities in its reflecting power, and a precisely positionable screen is interposed between the monochromator and specimen to cut out radiation reflected from imperfections below the monochromator surface. The system was designed to be tolerant of some imperfection in the monochromator and this objective was achieved. With Cu Kα1 radiation, a natural diamond (111) face and the asymmetric 220 reflection, a lateral compression of the beam by a factor of 22.6 was obtained. Section topographs are exhibited in which the spatial width of the incident beam is only 7 μm. A benefit of this technique is the possibility of reducing the wavelength bandwidth effective in recording the topograph to less than that of the Kα1 emission profile, and hence of reducing the contribution of dispersion to diffusion of the topograph image. The applicability of the method to synchrotron radiation sources is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011818
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  • 72
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    Digitale Medien
    A high-sensitivity double-beam triple-crystal X-ray spectrometer for lattice parameter and topographic measurements (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 207-210 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A dual-beam three-crystal spectrometer for high-sensitivity lattice-parameter comparison measurements of high-perfection crystals is described. It has a sensitivity, Δd/d, of up to ±3 x 10−8 when CuKα1 radiation is used. This spectrometer is also employed as a high-sensitivity double-crystal topographic camera. Examples of applications to doped float-zone and epitaxic layers of silicon crystals are reported, together with low- and high-temperature measurements done with a cryostat designed for high thermal stability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011946
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  • 73
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    Digitale Medien
    A new small-angle neutron scattering (SANS) instrument at ORNL using a position-sensitive area detector (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 259-264 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The small-angle neutron scattering (SANS) machine in operation at the Oak Ridge Research Reactor (ORR) has shown the usefulness of the Borkowski–Kopp two-dimensional position-sensitive proportional counter used with double pyrolytic graphite-crystal monochromators. Although built with little latitude for machine optimization, it is capable of performing useful research in cases involving large scattering cross sections. Many of this machine's features are prototypic to the new machine under construction at the High-Flux Isotope Reactor (HFIR) for the National Center for Small-Angle Scattering Research.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012034
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  • 74
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    Digitale Medien
    The production of cold and ultracold neutrons by a moving crystal lattice (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 265-272 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: It is demonstrated that the diffraction properties of a moving crystal lattice can be employed for the production of very cold and ultracold neutrons. The necessary formulation for the calculation of the diffracted neutron intensity is developed. It is shown that such a device is indeed possible and, as a source of ultracold neutrons, constitutes a practical alternative to existing mirror-reflection neutron turbines.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012046
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  • 75
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    Digitale Medien
    X-ray studies of growth striations in Fe–2.8 wt%Si alloy single crystals (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 297-303 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Growth striations in Fe–Si alloy single crystals are studied by X-ray diffraction topography. Variations of interplanar spacing are measured using double-crystal reflection topographs and variations of Si content are calculated taking into account the surface stress relaxations. The results are compared with those obtained by electron-microprobe analysis. The contrast observed in Lang transmission topographs is explained on the basis of the dynamical theory of X-ray diffraction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012095
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  • 76
    Digitale Medien
    Digitale Medien
    Revidierte Kristalldaten für Kaliumhexachlorotellurat, K2TeCl6 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 305-307 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: From well resolved Guinier powder diagrams the space group of potassium hexachlorotellurate is shown to be P21/n (No. 14). At room temperature the lattice parameters are a = 7.165 (1), b = 7.175 (1), c = 10.189 (1) Å and β = 90.24 (1)°. No phase transition occurs upon cooling the compound down to 130±10 K where a = 7.062 (1), b = 7.206 (1), c = 10.040 (2) Å and β = 90.61 (1)°. It appears however that at 323±5 K the powder pattern of monoclinic K2TeCl6 has already merged into that of the cubic phase [space group Fm3m, a = 10.189 (1) Å].
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012113
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  • 77
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    Digitale Medien
    Unit-cell dimensions and space group of cholesteryl ethyl carbonate (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 310-310 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Unit-cell dimensions and space group of cholesteryl ethyl carbonate (C30H50O3) are: monoclinic P21, Z = 4, a = 17.89 (1), b = 11.34 (1), c = 13.11 (1) Å, β = 105.2 (2)°.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012137
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  • 78
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    Digitale Medien
    Crystal data for bis(1,10-phenanthroline)–hydrochloric acid dihydrate, (C12H8N2)2.HCl.2H2O (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 315-315 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The power data for the compound bis(1,10-phenanthroline)–hydrochloric acid dihydrate are reported. It is monoclinic, Pb or P2/b, with a = 12.27 (3), b = 26.20 (8), c = 3.716 (7) Å, β = 115.6 (2)°, u = 1078 Å3. Z = 2, Dm = 1.33, Dc = 1.31 Mg m−3.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012150
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  • 79
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    Digitale Medien
    Average of equivalent reflections using small computers (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 316-317 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A Fortran IV program for averaging equivalent reflections is described. It needs little memory storage and can be used with minicomputers. The 11 Laue groups are considered and various treatments and analyses of the data are included.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012162
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  • 80
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    Digitale Medien
    Lengthening the focal spot in Elliot rotating-anode X-ray sets (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 338-338 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Lengthening the focal spot in EIIiott rotating-anode X-ray tubes can be increased if positive-ion bombardment of the filament is reduced.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012186
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  • 81
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    Digitale Medien
    A device for powder-film calibration (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 339-339 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The commercially available Gandolfi camera (1967) provides for air evacuation but, presumably for that reason, has no provision for forcing the powder film flush against the cylindrical wall of the casette, the way it is done, for example, in Debye–Scherrer cameras.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012216
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  • 82
    Digitale Medien
    Digitale Medien
    Extra electron reflections observed in YFe2O4, YbFe2O4, Yb2Fe3O7 and Yb3Fe4O10 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 395-397 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The modulations from the ideal crystal structures are detected for the non-stoichiometric compound YFe2O4 and related compounds such as YbFe2O〈inf/〉4, Yb2Fe3O7 and Yb3Fe4O10 through the extra reflections in the electron-diffraction patterns. Those reflections observed in YFe2O3.91 might possibly be related to the characteristic magnetic behavior denoted as `parasitic ferrimagnetism'.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S002188988001237X
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  • 83
    Digitale Medien
    Digitale Medien
    Crystal data for two hydrogenation products of triptycene: C20H26 and C20H32 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 399-399 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Crystal data are reported for two compounds obtained by catalytic hydrogenation of triptycene (C20H14), ACC(C20H26) and TTC(C20H32).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012393
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  • 84
    Digitale Medien
    Digitale Medien
    Fundamentals of crystal growth 1 by F. Rosenberger (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 401-402 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012435
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  • 85
    Digitale Medien
    Digitale Medien
    A fast and accurate way of aligning X-ray cameras (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 633-633 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012976
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  • 86
    Digitale Medien
    Digitale Medien
    Nondestructive evaluation of semiconductor materials and devices by J. N. Zemel (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 342-342 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012253
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  • 87
    Digitale Medien
    Digitale Medien
    New methods of X-ray diffraction spectrometry. I. Image formation in curved crystals (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 354-358 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Image formation in a dispersive system, consisting essentially of a perfect cylindrically bent crystal in association with a point source, has been studied both for transmission and reflection. The Laue and Bragg conditions have been calculated together with the dispersive power. The treatment has been extended to include two crystals. In the single-crystal case and also for most versions of two-crystal combinations a point or line focus is required to obtain highly resolved spectra. A few versions of the two-crystal arrangement can be made to be focusing, thereby enabling the use of an extended radiation source.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012289
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  • 88
    Digitale Medien
    Digitale Medien
    Zone-axis pattern maps for graphite (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 364-367 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Zone-axis pattern maps for graphite have been obtained using multiple-micrograph montages. Maps have been constructed with bend-contour micrographs and with Kossel–Möllenstedt patterns, both obtained at 100 kV. The two kinds of map are compared.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012307
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  • 89
    Digitale Medien
    Digitale Medien
    Multiple-scattering treatment for small-angle scattering problems (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 385-390 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Analytical explicit expressions have been derived for multiple-scattering effects under assumptions which are usually fulfilled in small-angle scattering. The expressions are used to evaluate quantitatively distortions of scattering patterns caused by multiple scattering. The distortions are discussed in terms of changes of the forward-scattering cross section, the radius of the gyration, the integrated intensity, the Porod region and Porod constant. In addition, the analytical expressions have been used to calculate the scattering cross section of the sample from scattering patterns which are strongly affected by multiple scattering.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012356
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  • 90
    Digitale Medien
    Digitale Medien
    A search for internal distortion in CeBi (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 529-532 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: At the IA magnetic transition (12.5 K) in CeBi a theoretical study has suggested that either the Ce or Bi sublattices should move with respect to the other. Such a distortion would give rise to extra reflections of the form 0′0′l+½. A search for such a reflection using a Bond X-ray diffraction technique was conducted. The 007½ line was not found and an upper limit of 2̃ × 10−4 was set for the magnitude of the expected internal distortion. This limit is valid for a surface layer whose thickness equals the penetration depth of the X-radiation which is about 0.4 × 10−2 mm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012721
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  • 91
    Digitale Medien
    Digitale Medien
    Experiment investigation of the ferroelastic domain structure in cesium lead chloride in the monoclinic phase (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 539-543 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The experimental observations of the ferroelastic domain structure of CsPbCl3, in its monoclinic phase, are compared to the results obtained by a theoretical analysis using twinning by pseudo-symmetry, or a tensor method. The various kinds of observed domain walls are identified with the permissible W and S walls.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012745
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  • 92
    Digitale Medien
    Digitale Medien
    An automated peak fitting procedure for processing protein diffraction data from a linear position-sensitive detector (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 563-571 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A data processing method is presented which allows reliable intensities to be obtained from the weak neutron diffraction produced by protein crystals. Three components are used to reduce the errors in the intensities: (1) a pattern-recognition technique to find the peak centers; (2) a position-sensitive linear detector, whose spatial resolution characteristics increase the accuracy with which the boundary between the peak and background may be defined; and (3) an averaging technique to obtain accurate backgrounds. Test results with a 2.2 Å data set collected from a small crystal of the proteolytic enzyme trypsin indicate that data processed by this method are superior in both reproducibility and statistical reliability to the same data processed by more conventional methods. Refinement results with the trypsin structure indicate that the data are accurate as well.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012770
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  • 93
    Digitale Medien
    Digitale Medien
    Intensity corrections for one-dimensional structure determination (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 585-590 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Procedures for correcting experimental diffraction intensities in the small-angle region for the determination of one-dimensional structures are presented. The diffraction patterns in question consist of meridional streaks which are transversely broadened due to: (1) finite fibril radius, (2) imperfect fibrillar orientation, (3) lamellar curvature or (4) instrumental broadening. Three methods are developed and compared for obtaining corrected intensities in the presence of these effects. One method uses direct integration over all reciprocal space. Two complementary techniques involve correction of integrated layer line or meridional peak intensities; the correction factors are shown to be the transverse integral widths of the layer lines, suitably modified for instrumental broadening.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012800
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  • 94
    Digitale Medien
    Digitale Medien
    Recherche des systèmes de glissement actifs dans un processus de déformation plastique du polycristal. III. Comportement du facteur de Taylor dans le cas du glissement cristallographique dans les cristaux cubiques (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 597-600 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The boundaries of the regions within which a specific set of slip systems maximizes the Taylor factor M (g, q) are plotted in a stereographic triangle for several values of the contraction ratio q and an axially symmetric flow. For q = 0.5 these boundaries are shown to be mostly circles on the unit sphere.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012824
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  • 95
    Digitale Medien
    Digitale Medien
    Molecular motions in a solid–solid transition of sodium dodecylsulphate (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 608-610 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Microscopic, single crystals of sodium dodecylsulphate, Na+.C12H25O4S−, have been investigated by electron diffraction under conditions of carefully controlled temperature. The studies showed that the specimens are two-dimensional in the crystallographic sense and that a first-order solid-solid transition takes place at 283 K. The existence of the transition is shown by the discontinuous change of lattice parameters and the abrupt disappearance of all hk0 reflections with h + k odd at this temperature. Linear, thermal-expansion coefficients along the a and b directions are reported for the low-temperature form. The phenomenon is compared with similar transitions occurring in paraffins, and interpreted as the onset of rotational motions by the hydrocarbon chains of sodium dodecylsulphate about their longitudinal axes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S002188988001285X
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  • 96
    Digitale Medien
    Digitale Medien
    Données cristallographiques sur (−)-[Rh(en)3]Br3.H2O (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 616-617 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: (−)-[Rh(en)3Br3.H2O is isomorphic with cobalt salts (+)-[Co(en)3Br3.H2O and (+)-[Co(en)3]Cl3.H2O. It crystallizes in the quadratic space group P4321. Lattice constants are a = 10.070 (2) and c= 16.688 (5) Å with four formula units in the unit cell.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012915
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  • 97
    Digitale Medien
    Digitale Medien
    On the geometrical conditions for recording X-ray topographs of large crystal slices (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 1-6 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Geometrical aspects of large-scale transmission X-ray topography with Kα1 radiation have been considered. It is shown that the height of a crystal slice which can be effectively recorded is given as Heff = 2L(Δλ/λ)1/2, where L is the source-to-sample distance and Δλ is the wavelength difference for the Kα doublet. A geometrical scheme termed the moving-slit simulation has been developed to examine the influence of various experimental parameters such as the widths of source and slits, the involved distances and the adjustment of the sample. The usefulness of this scheme is demonstrated experimentally.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011417
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  • 98
    Digitale Medien
    Digitale Medien
    The application of asymmetric Bragg reflections in the Bond method of measuring lattice parameters (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 12-16 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Asymmetric Bragg reflections have been applied in precise lattice-parameter determinations of thin, near-surface single-crystal layers. The measurements were performed by the Bond method which combines considerable simplicity and high accuracy. The reflection asymmetry greatly reduces the penetration depth of X-rays but requires a careful application of proper corrections. An example is described of the measurement of lattice-parameter changes in the near-surface layer of a silicon crystal doped with boron.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011430
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  • 99
    Digitale Medien
    Digitale Medien
    Determination of particle-size distribution functions from small-angle scattering data by means of the indirect transformation method (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 7-11 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Small-angle scattering data from polydisperse systems can be evaluated under the assumption that all particles have the same shape and that the size distribution depends only on one linear size parameter R. The shape of the particles is assumed to be known a priori. The corresponding size distribution function for the number of particles Dn(R) or for the volume Dv(R) can be computed from the smeared, unsmoothed scattering data by the indirect transformation method restricting the range of definition of the D(R) functions to a finite range Rmin ≤ Rmax. Rmin may be equal to zero, Rmax is limited by the sampling theorem of the Fourier transformation. The resolution in real space is given by the distance of the knots of the B spline functions approximating the size distribution function. The propagated statistical error band in real space can be computed using the inverted matrix of the normal equations. The method gives satisfactory results even in those cases where the shape of the particles is not known exactly, and is superior to analytical methods if the termination effect is critical.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011429
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  • 100
    Digitale Medien
    Digitale Medien
    The formation of varieties of carbon ordering in pseudobinary compounds of V2C, Nb2C and Ta2C (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 17-23 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Ordering of carbon atoms in (V1 − xNbx)2C, (Nb1 − xTax)2C and (V1−xTax)2C has been studied by electron diffraction. In addition to three basic structures of V2C (ζ-Fe2N type), Nb2C and Ta2C [anti-Cd(OH)2 type], two superstructures are found at intermediate compositions of (V1 − xTax)2C. One of them appears also in (V1 − xNbx)2C at x = 0.2–0.5 and the other in (Nb1 − xTax)2C at x = 0.1–0.5. In these five structures, carbon atoms are aligned along the c axis occupying alternate octahedral interstices in the h.c.p. metal cell. The existence conditions of these structures are interpreted by a pairwise interaction model regarding the carbon atom-vacant interstice rows parallel to the c axis. The interaction energies for these rows up to the third-neighboring pairs are estimated from diffuse-scattering profiles observed on the specimens quenched from high temperatures. The results are discussed in comparison with the theoretical proposals for the ground-state structures based on a triangular-lattice gas model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880011442
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