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  • International Union of Crystallography (IUCr)
  • 1980-1984  (5,963)
  • 21
    Electronic Resource
    Electronic Resource
    BLOKJE, a computer program to calculate the domain of an atom in a structure (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 151-153 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A computer program has been written with the aim of calculating the domain of an atom in a structure. The domain may be limited by planes situated half-way between the atoms, or at a distance that takes into account the relative radii of the atoms. Data concerning this domain and the corresponding coordination polyhedron are computed and printed. Punched cards, to be used in a special plotting program, can also be produced. Three types of weighted coordination number are calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188988100900X
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  • 22
    Electronic Resource
    Electronic Resource
    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
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889880012009
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  • 23
    Electronic Resource
    Electronic Resource
    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
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889880012022
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  • 24
    Electronic Resource
    Electronic Resource
    An estimate of the surface roughness effect (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 219-222 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A method for the computation of the effect of rough sample surfaces on diffraction intensities is described. Though the model used for the calculation is a special simple one, it is exact. The method is illustrated by its application to a surface whose boundary is a saw-tooth. Possible generalizations of the character of the surface roughness effect and how it depends on the dimensions of the surface irregularities are inferred from the calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889881009229
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  • 25
    Electronic Resource
    Electronic Resource
    Preliminary investigation of a new X-ray film (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 256-260 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A new X-ray film, produced by CEAVERKEN in Sweden, has recently become available. Some properties of this film have been compared to three other films commonly used in the recording of X-ray diffraction intensities (Agfa T4, Kodak No-screen, Ilford Industrial G). The linearity of CEA film has been found to be similar to that for Agfa and Ilford. The speed of the new film is about 10% lower than Agfa or Kodak, and the film factor was measured to be 2.9 for Cu Kα radiation. The background level is significantly lower than on the other three films investigated. This combination of properties makes CEA film suitable for routine collection of X-ray diffraction data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188988100931X
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  • 26
    Electronic Resource
    Electronic Resource
    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
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889880012332
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  • 27
    Electronic Resource
    Electronic Resource
    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
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: 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].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889880012381
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  • 28
    Electronic Resource
    Electronic Resource
    Crystal data for Lu2Si2O7 (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 349-350 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Lutetium pyrosilicate single crystals Lu2Si2O7 were grown by a floating-zone technique associated with an arc image furnace. The compound is monoclinic, space group C2/m, Z = 2, a = 6.7665 (14), b = 8.8407 (18), c = 4.7195 (27) Å and β = 101.95 (3)°. Indexed X-ray powder data at 294 K are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889881009527
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  • 29
    Electronic Resource
    Electronic Resource
    Crystallographers (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 353-354 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889881009564
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  • 30
    Electronic Resource
    Electronic Resource
    Revised crystal data of BaZnGeO4 (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 400-401 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188988001240X
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