标题： 半赫斯勒化合物热电性能的最新进展 显示英文标题

标题： Recent Advances in Thermoelectric Performance of Half-Heusler Compounds

摘要： 半赫斯勒相（空间群F43m，C1b）最近因其在中高温范围内的热电转换潜力而受到广泛关注。 研究最多的是一类RNiSn型半赫斯勒化合物，其中R代表难熔金属Hf、Zr和Ti。 这些化合物表现出高功率因子和高功率密度，以及良好的材料稳定性和可扩展性。 然而，由于它们的高热导率，这些材料的无量纲优值（zT）长期以来一直停滞在1附近。 自2013年以来，半赫斯勒化合物的可验证ZT在500至900摄氏度的温度范围内，对于n型和p型化合物都从1上升到接近1.5。在本简要综述中，我们总结了最近取得的进展以及实现高ZT的方法。 特别是，我们更详细地讨论了作者及其合作者研究的较少被利用的应变缓解效应和掺杂剂共振态效应。 最后，我们指出了进一步发展的方向。 关键词：半赫斯勒化合物；优值；功率密度；晶格无序；掺杂剂共振态 显示英文摘要

摘要： Half-Heusler phases (space group F43m, C1b) have recently captured much attention as promising thermoelectric materials for heat-to-electric power conversion in the mid-to-high temperature range. The most studied ones are the RNiSn-type half-Heusler compounds, where R represents refractory metals Hf, Zr, and Ti. These compounds have shown a high-power factor and high-power density, as well as good material stability and scalability. Due to their high thermal conductivity, however, the dimensionless figure of merit (zT) of these materials has stagnated near 1 for a long time. Since 2013, the verifiable ZT of half-Heusler compounds has risen from 1 to near 1.5 for both n- and p-type compounds in the temperature range of 500 to 900 degrees C. In this brief review, we summarize recent advances as well as approaches in achieving the high ZT reported. In particular, we discuss the less-exploited strain-relief effect and dopant resonant state effect studied by the author and his collaborators in more detail. Finally, we point out directions for further development. Keywords: half-Heusler compounds; figure of merit; power density; lattice disorder; dopant resonant states