Anharmonicity of Lattice Vibrations and the Thermal Properties of Cd1- xSrxF2 Solid Solutions

被引：2
作者：
Novikov, V. V. [1 ]
Mitroshenkov, N. V. [1 ]
Kuznetsov, S. V. [1 ]
Popov, P. A. [1 ]
Buchinskaya, I. I. [2 ]
Karimov, D. N. [2 ]
Koshelev, A. V. [2 ]
机构：
[1] Petrovskii Bryansk State Univ, Bryansk 241036, Russia
[2] Russian Acad Sci, Crystallog & Photon Fed Res Ctr, Shubnikov Inst Crystallog, Moscow 119333, Russia
来源：
PHYSICS OF THE SOLID STATE | 2020年 / 62卷 / 04期
基金：
俄罗斯基础研究基金会;
关键词：
solid solutions; lattice parameters; low temperatures; thermal expansion; thermal conductivity; RARE-EARTH-ELEMENTS; CRYSTAL-GROWTH; CONDUCTIVITY; FLUORIDE; EXPANSION;
D O I：
10.1134/S1063783420040174
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The temperature changes in the crystal lattice parameters a(T) of cadmium and strontium fluorides and also of their mutual Cd1 - xSrxF2 (x = 0.23, 0.50) solid solutions has been studied experimentally at temperatures 5-300 K. The temperature dependences of the unit cell volume of these fluorides are analyzed in the Debye-Einstein model. The lattice vibration anharmonicity of the solutions is found to substantially influence their thermal properties due to a disordering of their crystal structure. The model parameters and the characteristics of the anharmonic contribution have been determined. The results are used to calculate the concentration dependence of the thermal conductivity of the Cd1 - xSrxF2 solid solutions at T = 300 K in the Callaway model, and the calculation results are compared to the available experimental data. It is shown that the thermal conductivity of the single-crystal solid solution of the system under study can be estimated on the base of the data on the thermal properties of the solution components obtained from powder samples.
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收藏
页码：714 / 721
页数：8
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