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在立方 GeMnTe₂和高热电性质的异调扭曲₂-x%SbTe

Jinfeng Dong^1,2, Yilin Jiang¹, Yandong Sun³

¹State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.

Journal of the American Chemical Society

|January 17, 2023

概括

一种热电材料GeMnTe2显示局部扭曲. 用SbTe合金提高了热电性能,由于增强的Seebeck系数和低导热性,达到ZT值约1.5.

科学领域:

材料科学
固态物理
热电器

背景情况:

GeMnTe2具有立方岩盐结构,使其成为中温热电应用的候选者.
中子散射数据显示了GeMnTe2的局部扭曲,Ge2+离子从理想的八面体位置被移除.

研究的目的:

研究SbTe合金对GeMnTe2热电性能的影响.
了解增强热电性能的结构和电子起源.

主要方法:

对中子总散射数据的对分布函数分析.
将GeMnTe2与SbTe合金,以调整载体度.
包括Seebeck系数,功率因子和导热率在内的热电特性.

主要成果:

在广泛的温度范围 (300-823 K) 中,GeMnTe2-15.1%SbTe具有高的Seebeck系数 (>200 μV K-1).
合金表现出高密度的有效质量和高权重的移动性,其功率系数为15μWcm-1K-2在823K.
在823K处的非常低的晶格导热率 (~0.5Wm-1K-1) 是由于结构障碍和纳米粒子.
在400 - 823K之间达到~1.5的峰值ZT和0.96的平均ZT (ZTave).

结论:

SbTe合金有效调整了GeMnTe2的电子结构,增强了其热电特性.
结构复杂性,包括离中心离子和混乱,显著降低了晶格导热性.
优化的GeMnTe2-15.1%SbTe组成显示出作为高效的中温热电材料的巨大潜力.

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