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  • International Union of Crystallography (IUCr)  (1.031)
  • American Institute of Physics (AIP)
  • 1970-1974  (1.031)
  • 1972  (1.031)
Sammlung
Verlag/Herausgeber
Erscheinungszeitraum
  • 1970-1974  (1.031)
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    X-ray diffraction measurements of the cation distributions in spinel structures (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 18-23 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: X-ray diffraction methods are applied to determine the cation distribution and the oxygen positional parameter in low-substituted magnetites with Al3+, Ga3+, or In3+ as substituents. It is possible to conclude that the tetrahedral site preference increases in the sequence Al3+, Fe3 +, In∼Ga3+, in good agreement with magnetic properties of similar systems and with theoretical considerations of various authors. The presence of a part of the Al3+ ions in tetrahedral sites is Confirmed by means of the Mössbauer effect. Reliability of the methods and errors are discussed. X-ray methods such as these appear to be potentially applicable for industrial checks in ferrite production.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889872008660
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  • 2
    Digitale Medien
    Digitale Medien
    Détermination des paramètres des mailles élémentaires de composés definis des systèmes Pu–Cu, Pu–Ga–Cu, et Pu–Ga–Ni (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 47-50 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Diffusion experiments involving Pu–Cu, PuGa–Cu and PuGa–Ni couples, have brought into evidence the binary compounds PuCu2 and PuCu4, a ternary compound PuCu3 with variable small amounts of gallium and the ternary compounds Pu2Ni2Ga and PuNiGa. The crystalline parameters of these compounds were determined by the Debye–Scherrer method using alloys obtained by direct processing. Powder X-ray diffraction showed the isomorphism of PuCu2 with CeCu2 and that all the above compounds are orthorhombic.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889872008702
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  • 3
    Digitale Medien
    Digitale Medien
    K vivodu formuli dlya krivoy profilya istinnogo raspredeleniya intensivnost po uglam rasseyaniya, obuslovlennoy faktorami dispernosti i formi oblastey kogerentnogo rasseyaniya (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 90-92 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The formula giving the variation of X-ray intensity versus the diffraction angle due to dispersion factors and the form of the domains of coherent scattering is derived. For this case a general relation between the factor c of the Scherrer formula and the factor k = I(x)/Imax of the distribution curve is derived.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889872008842
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  • 4
    Digitale Medien
    Digitale Medien
    A cryogenic attachment for single crystal X-ray studies (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 102-106 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: An apparatus is described for single-crystal X-ray diffraction studies at fixed or variable temperatures between room temperature and about 7 °K. Examples of some applications of the system are also given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889872008878
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  • 5
    Digitale Medien
    Digitale Medien
    Interstratified layer structure of the organo-montmorillonites as revealed by electron microscopy (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 119-124 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Layer structures of octadecylammonium–montmorillonite and trimethyloctadecylammonium:steramide–montmorillonite were studied by electron microscopy. Curled shapes of some lamella flakes of the organo-montmorillonites were found. Lattice images of the layers observed at the curled edges of the flake showed regular and irregular layer expansions caused by the interlayer adsorption of the organic compounds. Some of the results exhibited local variation of the layer expansion even within one particular layer. The local variation probably originated from the intrinsic nature of the montmorillonite layer. The arrangements of the alkyl chains of the adsorbed organic compounds between the layers of montmorillonite were interpreted on the basis of interlayer distances obtained from the lattice images of the layers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889872008908
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  • 6
    Digitale Medien
    Digitale Medien
    Programme en FORTRAN IV pour l'analyse des données expérimentales relatives à la diffusion des rayons X par des substances liquides, amorphes et microcristallisées (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 14-18 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A FORTRAN IV computer program has been written for the elaboration of X-ray intensities diffracted by liquid, amorphous and microcrystallized substances. The experimental data, corrected for both polarization and absorption, after conversion into absolute units are inverted into radial distribution functions. Various possibilities are provided for the inversion of the intensity data. Results are then plotted with the IBM 1627 data plot accessory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889872008659
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  • 7
    Digitale Medien
    Digitale Medien
    Experimental verification of small-angle X-ray scattering collimation corrections (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 40-46 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: In order to test the collimation correction methods routinely applied to small-angle X-ray scattering data, scattering curves for several samples have been obtained both with a Kratky camera and with a Beeman four-slit collimation system. Since the two collimation systems used quite different slit arrangements, there were appreciable differences in the measured curves obtained with the two systems for a given sample. However, after the appropriate collimation corrections had been applied, the corrected curves were nearly identical. This agreement, which is not surprising because of the thorough tests previously applied to collimation correction procedures, indicates that in the correction of experimental curves, no unforeseen problems appear that are not present in the earlier, more idealized tests, which employed test functions to simulate experimental curves. A comparison has been made of a few other properties of the two collimation systems, including the intensity obtainable for a given resolution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889872008696
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  • 8
    Digitale Medien
    Digitale Medien
    Notes and News (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 56-56 
    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/S0021889872008751
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  • 9
    Digitale Medien
    Digitale Medien
    The application of truncated integrated intensity to the analysis of broadened X-ray diffraction lines (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 57-63 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: It is shown that the function (truncated integrated intensity × range) versus range has similar theoretical merits to the variance–range function for the analysis of broadened X-ray diffraction lines. A large number of diffraction lines with a range of breadths, provided by samples of lithium ferrite, are analysed by both methods and found to give closely comparable results for the Wilson parameter A′(0)/A(0). In each case the influence of the Kα satellite group is eliminated by exploiting its intensity distribution derived with the aid of the centroid range function. The effects of non-linear range dependent terms on the measured variance slopes and their equivalents from the new analysis are also discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889872008775
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  • 10
    Digitale Medien
    Digitale Medien
    Modifizierte Laue-Methode für thermische Neutronen (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 83-88 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A bent copper monochromator focuses neutrons of a large range of wavevectors on a KCl crystal. The mean wavelength is 1 Å. The Bragg reflexions of the KCl crystal are simultaneously recorded by a photographic method. Indexing procedures are discussed. A classical Laue photograph with identical sample orientation is used for comparison.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889872008829
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