Study the effect of alloying on the phase transition behavior and thermoelectric properties of Ag2S

被引：0

作者：

Li, Lanwei ^{[1
,2
]}

Peng, Chengxiao ^{[1
,2
]}

Chen, Jing ^{[3
]}

Ma, Zheng ^{[1
,2
]}

Chen, Yanqun ^{[1
,2
]}

Li, Shuyao ^{[1
,2
]}

Wang, Jianli ^{[1
,2
]}

Wang, Chao ^{[1
,2
]}

机构：

[1] Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng,475004, China

[2] International Joint Research Laboratory of New Energy Materials and Devices of Henan Province, Henan University, Kaifeng,475004, China

[3] Department of Technology and Physics, Zhengzhou University of Light Industry, Zhengzhou,450002, China

来源：

Journal of Alloys and Compounds | 2021年 / 886卷

基金：

中国国家自然科学基金;

关键词：

Silver alloys - Copper alloys - Cobalt alloys - Thermoelectricity - Alloying - Alloying elements;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Phase transition will lead to abrupt change of thermoelectric material's properties, which will have a negative influence on the application of thermoelectric device. Therefore, avoiding the phase transition of Ag2S is particularly important for its heat collection applications. In this work, we reported, for the first time, that Cu-Se co-alloying in Ag2S can suppress phase transition and improve thermoelectric properties. Specifically, different elements and compounds alloying in Ag2S samples were prepared, and their influences on the phase change behavior and thermoelectric performance stability of Ag2S are systematically studied. It is found that the free enthalpy decreases and the heat absorption peak disappears for the Cu-Se co-alloyed Ag2S sample. In addition, the average lattice thermal conductivity is greatly reduced, and the κL of Ag1.8Cu0.2S0.5Se0.5 is around 0.27 Wm−1K−1 from 330 K to 450 K. Therefore, a high ZT is obtained for Cu-Se co-alloyed Ag2S. © 2021 Elsevier B.V.

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