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
