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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >EXAFS study of the temperature dependence of the Debye-Waller factor in ZnSe zincblende compound
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EXAFS study of the temperature dependence of the Debye-Waller factor in ZnSe zincblende compound

机译：EXAFS研究ZnSe Zincblende化合物的Debye-Waller因子的温度依赖性研究

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摘要

In this work, we investigate the temperature dependence of the Debye-Waller (DW) factor in a zincblende-type ZnSe crystal. For this purpose, we measured the extended x-ray absorption fine structure spectra at the Zn and Se K edges in the temperature range of 20-573 K. The DW factor can be described by two different models namely Einstein correlated model and Debye correlated model. The parallel and perpendicular DW factors, the Einstein parameters and Debye temperature are determined and discussed. The temperature dependence of the DW factor of the first, second and third bond distances corresponding to each edge are presented and discussed in terms of vibrational motion. The Einstein frequencies are compared to the vibrational densities of states. The vibrational motion of the first and second coordination shells are affected by the vibrational modes below the energy of the transverse optic modes and around the energy of the transverse acoustic modes, respectively. The DW factor extracted for each shell is influenced by different parts of the phonon spectrum.
机译：在这项工作中，我们研究了Debye-Waller（DW）系数在Zincblende型ZnSe晶体中的温度依赖性。为此目的，我们在20-573k的温度范围内测量Zn和Se k边缘处的延伸的X射线吸收细结构光谱。DW系数可以通过两种不同的模型描述，即Einstein相关模型和德义相关模型。确定并讨论平行和垂直的DW因子，Einstein参数和脱德比温度。在振动运动方面呈现和讨论了对应于每个边缘的第一，第二和第三键距离的DW系数的温度依赖性。将Einstein频率与各州的振动密度进行比较。第一和第二协调壳的振动运动分别受横向光学模式的能量和横向声模式的能量低于横向声学模式的振动模式的影响。为每个壳提取的DW系数受到声光谱的不同部分的影响。

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