Inter-atomic force constants from correlation effects among thermal displacement of atoms in PbTe
Inter-atomic force constants from correlation effects among thermal displacement of atoms in PbTe
复制标题
PbTe 中原子热位移相关效应的原子间力常数
DOI：
10.1080/08927022.2011.569547
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发表时间：
2012
影响因子：
2.1
通讯作者：
N. Igawa
中科院分区：
文献类型：
--
作者：
Xianglian;T. Sakuma;S. R. Mohapatra;H. Uehara;H. Takahashi;O. Kamishima;N. Igawa
用日本原子能机构JRR-3高分辨粉末衍射仪在10和294 K下对粉末PbTe进行了中子漫散射测量。在294 K下观察到明显的振荡漫散射强度。在精细化分析中，将原子热位移之间的相关效应纳入描述背景的函数中，对观测到的漫散射强度进行了分析。从关联效应和Debye-Waller温度参数的值得到了PbTe中第一和第二近邻原子之间的力常数。
Diffuse neutron scattering measurements have been performed on powder PbTe at 10 and 294 K using high resolution powder diffractometer installed at JRR-3 in Japan Atomic Energy Agency. Oscillatory diffuse scattering intensity is clearly observed at 294 K. The observed diffuse scattering intensities are analysed by including correlation effects among thermal displacements of atoms in the function describing background in refinement analysis. The force constants between the first and second nearest neighbouring atoms in PbTe are obtained from the values of correlation effects and Debye–Waller temperature parameters.