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  • American Institute of Physics  (5,227)
  • International Union of Crystallography (IUCr)  (940)
  • American Institute of Physics (AIP)
  • 1970-1974  (6,167)
  • 1973  (6,167)
Collection
Publisher
Years
  • 1970-1974  (6,167)
Year
  • 1
    Electronic Resource
    Electronic Resource
    On the relation between molybdenum trioxide and rhenium trioxide type crystal structures (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 28-30 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structural relatiion between MoO3-type and ReO3-type is clarified by considering layers of anions parallel to (13{\bar 1})MoO3 and (111)ReO3. MoO3 is then seen to be approximately cubic close-packed anions while ReO3 is cubic close-packed anions but with one-quarter of the anion sites unoccupied. The two structures may then be interconverted by a rotation operation resembling that which links ReO3- and PdF3-type structures. Photographs of ball models are used to illustrate the relations. No compounds are known which exhibit direct transition from ReO3-type to either MoO3- or PdF3-type. This is probably because of the large change in volume per anion. The interface between ReO3 and the close packed structures may be described as a dilation fault.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000069
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamical treatment of Kikuchi patterns (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 38-45 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A dynamical theory of Kikuchi patterns from thick crystals is developed, which takes into account the absorption of both the elastically and inelastically scattered electrons. The wave function describing the state of an inelastically scattered electron due to an elementary excitation of core electrons of the crystal atoms is calculated. The general formulae for the intensity of the pair of Kikuchi lines (hkl) and ({\bar hkl}) and bands are obtained. The intensity profiles of Kikuchi lines and bands are analyzed. For a thick crystal the `defect' line contrast and band contrast are reversed as a result of anomalous absorption of the inelastically scattered electrons. This is in accordance with observed experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000094
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  • 3
    Electronic Resource
    Electronic Resource
    Optical transforms edited by H. S. Lipson (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 109-109 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947300029X
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  • 4
    Electronic Resource
    Electronic Resource
    Patterson function of plagioclase satellites (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 127-133 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The real and imaginary parts of Patterson functions based on `e' and `f' satellites were calculated. In `e' satellite maps, Patterson interactions involving cations are most prominent and permit relatively simple calculation of the amplitudes and phases of 26 displacement modulation waves. The deformation of the silicate chain, which is apparently one of the major features of the plagioclase superstructure, is shown in detail. The interpretation of the `f' satellite Patterson function is less straightforward, but it shows clearly that the associated displacements are of very small amplitude, directed along [02{\bar 5}] and that they do not involve Na/Ca cations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000355
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  • 5
    Electronic Resource
    Electronic Resource
    A sphere-packing model for the prediction of lattice parameters and order in σ phases (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 342-352 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A model is presented for the determination of the unit-cell size for ordered and disordered binary σ phases from a geometry assuming spherical atoms. The basis of the calculations is the assumption of an average radius of the atoms occupying each of the five crystallographic sites in the unit cell. The model is then used to predict the changes in lattice parameters produced by fast-neutron irradiation and by the addition of a third element in some ternary a phases. The calculated parameters are compared with experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000938
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  • 6
    Electronic Resource
    Electronic Resource
    Direct structure determination in P1 and other noncentrosymmetric symmorphic space groups (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 480-481 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In non-centrosymmetric symmorphic space groups the correct phase set need not be the one with the best Σ2 consistency. A new criterion (P1C - {\sum_{h}} {\sum_{k}} {{(|U_{h}| - |U_{k}|)^{2}}\over{(1 - |U_{h + k}|)(1 - |U_{h - k}|)}}| π - (φh + k+ φh - k - 2φh)| is shown to be more powerful in specifying the correct phase set.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473001154
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  • 7
    Electronic Resource
    Electronic Resource
    Notes and News (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 485-485 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947300118X
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  • 8
    Electronic Resource
    Electronic Resource
    Directions of dislocation lines in crystals of ammonium hydrogen oxalate hemihydrate grown from solution (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 495-503 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The defect structures in elastically highly anisotropic crystals of ammonium hydrogen oxalate hemihydrate, NH4HC2O4.½H2O, space group Pnma, have been studied by X-ray topography. Most of the dislocation lines visible on the topographs are straight and show clearly defined directions which depend on Burgers vector and on growth direction. Burgers vectors parallel to [100], [010], [001], (101) and (011) have been observed. For these Burgers vectors, the variation of energy factor K with direction and the preferential directions of the corresponding dislocation lines in various growth sectors have been calculated. In most cases, observed and calculated directions agree well. The directions of a few dislocations tend to align parallel to low-indexed (symmetry) directions. The influence of the elastic anisotropy on the directions of the dislocation lines as well as the possibility of determining the Burgers vectors from observed preferential directions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473001257
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  • 9
    Electronic Resource
    Electronic Resource
    Electron diffraction study of short-range-order diffuse scattering from disordered Cu–Pd and Cu–Pt alloys (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 520-526 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The short-range-order diffuse scattering from disordered Cu-Pd and Cu-Pt alloys has been studied by electron diffraction using thin foils prepared from bulk specimens. Twofold and fourfold splittings of diffuse scattering are observed at 100, 110 and equivalent positions in the composition ranges from about 13 to 60 at.% Pd in the Cu-Pd system and up to about 45 at.% Pt in the Cu-Pt system. The separation of the split maxima increases with Pd or Pt content. A close investigation has revealed that the split maxima correspond to the intersections of slightly curved diffuse streaks around the 100 and 110 positions. These results can be interpreted well using the Fermi-surface-imaging theory proposed by Krivoglaz, indicating that the interaction potential in these alloys mainly originates from conduction electrons, and that the diffuse scattering reflects the form of the Fermi surface, i.e. the flatness normal to the (110) directions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473001300
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  • 10
    Electronic Resource
    Electronic Resource
    Direct determination of X-ray phases for tobacco mosaic virus protein using non-crystallographic symmetry (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 545-554 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The basic structural unit of tobacco mosaic virus (TMV) protein crystals is a ring of seventeen identical subunits. This non-crystallographic 17-fold symmetry has been used to determine signs of the X-ray refiexions in the centrosymmetric hk0 projection, in two different but related ways. The results are compared with those obtained by Gilbert [Ph.D. Thesis (1970), Univ. of Cambridge] using the method of single isomorphous replacement (SIR), and are shown to agree well for reflexions with (h + k) even. Owing to the special positions of the bound heavy atoms, reliable signs have not hitherto been available for reflexions with (h + k) odd. Evidence is presented to show that those obtained from the non-crystallographic symmetry are essentially correct.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947300135X
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