Elastic Moduli: a Tool for Understanding Chemical Bonding and Thermal Transport in Thermoelectric Materials
Elastic Moduli: a Tool for Understanding Chemical Bonding and Thermal Transport in Thermoelectric Materials
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弹性模量：了解热电材料中化学键合和热传输的工具
DOI：
10.1002/ange.202213649
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发表时间：
2023
影响因子：
--
通讯作者：
Zevalkink, Alexandra
中科院分区：
文献类型：
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作者：
Isotta, Eleonora;Peng, Wanyue;Balodhi, Ashiwini;Zevalkink, Alexandra
材料的弹性行为可以是解释热传输的有力工具。在热电学中，测量弹性模量-直接与声速相关-对于理解晶格热导率的趋势以及研究键的非谐性和相变至关重要，因为弹性模量对化学键的敏感性。在这篇综述中，我们介绍了弹性的基础知识，并从键合的角度解释了高温晶格软化的起源。然后，我们审查整个类的热电弹性数据，并探讨声速，非谐性和热导率的趋势。我们揭示了如何实验声速可以提高常见的热导率模型的准确性，并提出了一个关键的讨论Grüneisen参数估计弹性模量。读者将配备工具，利用弹性测量或计算，以准确地解释热传输趋势。
The elastic behavior of a material can be a powerful tool to decipher thermal transport. In thermoelectrics, measuring the elastic moduli—directly tied to sound velocity—is critical to understand trends in lattice thermal conductivity, as well as study bond anharmonicity and phase transitions, given the sensitivity of elastic moduli to the chemical bonding. In this review, we introduce the basics of elasticity and explain the origin of high‐temperature lattice softening from a bonding perspective. We then review elasticity data throughout classes of thermoelectrics, and explore trends in sound velocity, anharmonicity, and thermal conductivity. We reveal how experimental sound velocities can improve the accuracy of common thermal conductivity models and present a critical discussion of Grüneisen parameter estimates from elastic moduli. Readers will be equipped with tools to leverage elasticity measurements or calculations to accurately interpret thermal transport trends.