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  • International Union of Crystallography (IUCr)  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of short-range order in Ni–10 at.% Al single crystals by diffuse X-ray scattering (1987)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 525-533 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The diffuse scattering from single crystals of nominally Ni-10 at.% Al, quenched after heat treatment at 973 K, has been measured with Mo Kα radiation. The data were analysed for the contributions due to short-range order and static atomic displacements. Consistency of the structural parameters as determined by three different methods, the separation methods of Georgopoulos-Cohen and Boric-Sparks and the least-squares method of Williams, is demonstrated for the first time. The variation of the first few short-range-order parameters αlmn with the coordination shell Imn strongly resembles that of the L12 superstructure. Employing these parameters to model a short-range-ordered computer crystal with 13 104 atoms, a preference for configurations of the L12 superstructure type is found, though no Ni3Al embryos are observed. The values of αlmn rapidly reach those for a random solid solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767387099070
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  • 2
    Electronic Resource
    Electronic Resource
    Small-Angle Neutron Scattering of Precipitates in Ni-Rich Ni–Ti Alloys. II. Methods for Analyzing Anisotropic Scattering Data (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 30 (1997), S. 975-984 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Methods for analyzing small-angle neutron scattering data for single crystals with anisometric precipitates and anisotropic arrangement are described. A method for projecting the measured scattering intensity in a (110) plane and obtaining the anisotropic correlation function is described. The method uses an indirect Fourier transformation with Hermitian functions as the basis. The correlation function gives model-independent information on the precipitate form and arrangement. A modified paracrystal cluster model is also introduced and size polydispersity is included in a local monodisperse approximation. The size distribution is obtained by least-squares fitting. The correlation function and the cluster model give consistent results for the morphology of precipitates in Ni-rich Ni–Ti single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889897004706
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  • 3
    Electronic Resource
    Electronic Resource
    Shape of precipitates in Ni-Al-Mo single crystals (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 33 (2000), S. 465-468 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A method is presented to determine the shape of the average precipitate from anisotropic small-angle scattering patterns from single crystalline alloys during decomposition. The form factor squared of an average precipitate is described by an analytical expression with a single parameter, the morphology parameter α, to account for changes from spherical to cuboidal shape. The method is applied to microstructural states of Ni-12 at.% Al-2 at.% Mo and Ni10 at.% Al-5 at.% Mo after aging treatments of up to 10 h at 970 or 1070 K. The value of α increases with aging time and smaller Mo content, in good agreement with the average shape of precipitates obtained from transmission electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889800099969
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  • 4
    Electronic Resource
    Electronic Resource
    Small-angle neutron scattering investigation of the early stages of decomposition in Ni-rich Ni-Ti (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 33 (2000), S. 488-491 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: In-situ small-angle neutron scattering was performed on polycrystals and single crystals of Ni-10 to 12 at.% Ti at temperatures between 900 and 1240 K. A plateau in the integrated intensity as a function of aging time for polycrystalline Ni-11.3 at.% Ti at 900 K indicates the presence of a precursor state γ'' preceding the formation of the metastable γ' state, with a Ti concentration of 16.5(1.0) at.% in the particles. In the scattering patterns of a Ni-12.0 at.% Ti single crystal aged at 1200 and 1240 K, strong scattering intensities along 〈100〉 related to the coherent γ''/γ' states, and sharp streaks along 〈111〉 related to plates of the stable η phase appear successively. At 1240 K, the presence of the L12-related intensities along 〈100〉 is unexpected, as this temperature lies above the metastable miscibility gap suggested in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889800099957
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  • 5
    Electronic Resource
    Electronic Resource
    Small-angle neutron scattering of precipitates in Ni-rich Ni–Ti alloys. II. Methods for analyzing anisotropic scattering data. Erratum (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 31 (1998), S. 490-490 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A printer's error in the paper by Pedersen, Vyskocil, Schönfeld & Kostorz [J. Appl. Cryst. (1997). 30, 975–985] is corrected. The surname of the second author was given incorrectly as Vysckocil. The correct spelling is Vyskocil. The names of all of the authors of the paper are given correctly above.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889898006712
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  • 6
    Electronic Resource
    Electronic Resource
    Anisotropic mean-square displacements (MSD) in single-crystals of 2H- and 3R-MoS2 (1983)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 39 (1983), S. 404-407 
    Details
    ISSN: 1600-5740
    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/S0108768183002645
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