Abstract

The results of experimental measurements of the temperature dependence of the effective thermal conductivity of various forms of gallium antimonide (single crystal, polycrystals) are analyzed. The thermal conductivity is measured by the absolute steady-state method in the temperature and pressure ranges 273–423 K and 0.1–350 MPa, respectively. For polycrystalline compounds, the temperature dependence of the effective thermal conductivity in the entire investigation range is shown to decrease with pressure, retaining a pronounced power-law character. The pressure dependences of both the relative effective thermal conductivity at a fixed temperature and the dependence of the relative change in the power-law coefficient of the temperature dependence within the experimental error could be approximated by two-parameter power functions. A description of the PT dependence of the effective thermal conductivity in the entire investigation range is proposed, for which the correlative relationship of the pressure components is found. The anomalous behavior of the temperature dependence of the thermal conductivity of a single-crystal GaSb sample with an increase in pressure is revealed, for which a significant increase in the absolute value of the power-law coefficient of the temperature dependence is observed up to ~1.5 at P = 330 MPa. The pressure dependences of the effective thermal conductivity demonstrate a significantly greater and nonlinear relative increase in the thermal conductivity compared to a single crystal, which indicates a large contribution to the effective thermal conductivity of the grain boundaries.

中文翻译：

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压力对不同有序度锑化镓有效热导率温度依赖性的影响

摘要

分析了各种形式的锑化镓（单晶、多晶）的有效热导率的温度依赖性的实验测量结果。热导率分别在 273–423 K 和 0.1–350 MPa 的温度和压力范围内通过绝对稳态法测量。对于多晶化合物，在整个研究范围内，有效热导率的温度依赖性随压力而降低，并保持明显的幂律特性。固定温度下的相对有效热导率的压力依赖性和实验误差内温度依赖性的幂律系数的相对变化的依赖性可以通过双参数幂函数来近似。提出了整个研究范围内有效热导率的PT依赖性，并找到了压力分量的相关关系。揭示了单晶GaSb样品的热导率随压力增加的温度依赖性的异常行为，观察到温度依赖性的幂律系数的绝对值显着增加至~在P = 330 MPa时为1.5 。与单晶相比，有效热导率的压力依赖性表现出显着更大且非线性的相对增加，这表明对晶界的有效热导率有很大贡献。