Physics – Condensed Matter – Materials Science
Scientific paper
2009-02-11
J. Appl. Cryst. (2009). 42, 496-501
Physics
Condensed Matter
Materials Science
6 pages; 5 figures, revised
Scientific paper
10.1107/S0021889809010747
While synthesizing the single crystals of novel materials is not always feasible, orienting the layered polycrystals becomes an attractive method in the studies of angular dependencies of inelastic scattering of x-rays or neutrons. Putting in use the Rietveld analysis of layered structures in novel manganites and cuprates we develop the studies of their anisotropic properties with oriented powders instead of single crystals. Densities of phonon states (DOS) and atomic thermal displacememts (ATD) are anisotropic in the A-site ordered manganites LnBaMn2Oy of both y=5 and y=6 series (Ln=Y, La, Sm, Gd). We establish the angular dependence of DOS on textures of arbitrary strengths, link the textures observed by x-ray and gamma-ray techniques, and solve the problem of disentanglement of Goldanskii-Karyagin effect (GKE) and texture in Moessbauer spectra.
Nomura Kazumasa
Rykov Alexandre I.
Seto Makoto
Ueda Yohei
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