各向异性声子DOS：Rietveld和Mossbauer织构分析在取向粉末中的应用
Anisotropic phonon DOS: the application of Rietveld and Mossbauer texture analysis in aligned powders
摘要：
虽然合成新材料的单晶并不总是可行的，但在X射线或中子的非弹性散射的角度依赖性的研究中，定向层状多晶成为一种有吸引力的方法。运用Rietveld层状结构分析方法，我们研究了新型锰氧化物和铜氧化物的各向异性，用定向粉末代替单晶。A位有序锰氧化物LnBaMn_2 O_y（y=5和y=6系列）（Ln=Y，La，Sm，Gd）的声子态密度（DOS）和原子热位移（ATD）都是各向异性的。建立了任意强度织构对态密度角的依赖关系，将X射线和γ射线观测到的织构联系起来，解决了穆斯堡尔谱中Goldanskii-Karyagin效应（GKE）和织构的解纠缠问题.
英文摘要：
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.
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