Abstract

Thermal diodes, in which the magnitude of the heat flow |J| changes with its direction, are a key technology for constructing heat management systems. Composite thermal diodes are composed of two materials possessing opposite temperature dependence of thermal conductivity. Silver chalcogenides Ag₂(S,Se,Te) were employed in this work because of their drastic change in thermal conductivity, with a phase transition in the temperature range of 300 K < T < 450 K. A jump of 200% to 500% in their thermal conductivity is observed at the phase-transition temperature, most likely due to the change in electron thermal conductivity. A thermal diode consisting of Ag₂S_0.6Se_0.4 and Ag₂S_0.1Te_0.9, both of which were selected by considering the measured thermal conductivity, has been prepared, and its performance evaluated. The developed thermal diode was confirmed to possess a thermal rectification ratio (TRR) = |J_large|/|J_small| = 2.7 ± 0.1 when installed between two heat reservoirs kept at T_H = 413 K and T_L = 300 K. Notably, this TRR is the highest ever reported for a solid-state thermal diode.

中文翻译：

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Ag 2（S，Se，Te）组成的高性能固态热敏二极管

摘要

热二极管，其中热流的大小| J | 改变其方向，是构建热量管理系统的关键技术。复合热敏二极管由两种材料组成，它们具有与导热率相反的温度依赖性。银硫属元素化物Ag ₂（S，Se，Te）因其热导率急剧变化而在300 K < T  <450 K的温度范围内发生相变，因此被采用 。跃迁200％至500％在相变温度下观察到它们的热导率最可能是由于电子热导率的变化。由Ag ₂ S _0.6 Se _0.4和Ag组成的热敏二极管已经准备了两种S ₂ Te _0.1 Te _0.9，这两种材料都是通过考虑测得的热导率选择的，并对其性能进行了评估。确认已开发的热敏二极管具有热整流比（TRR）= | J_大| / | _小J | 当安装在两个保持在T _H  = 413 K和T _L  = 300 K的储热器之间时，它的导通电阻为2.7±0.1 。值得注意的是，该TRR是固态热敏二极管有史以来的最高记录。