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Promising Zintl-Phase Thermoelectric Compound SrAgSb

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posted on 2020-08-06, 21:59 authored by Weiming Zhang, Chen Chen, Honghao Yao, Wenhua Xue, Shan Li, Fengxian Bai, Yifang Huang, Xiaofang Li, Xi Lin, Feng Cao, Jiehe Sui, Shufang Wang, Bo Yu, Yumei Wang, Xingjun Liu, Qian Zhang
Zintl-phase thermoelectric materials have garnered a lot of attention because of their intrinsic electron-crystal and phonon-glass structures. In this work, a series of ZrBeSi-type Zintl-phase compounds (SrAgSb, EuAgSb, and EuCuSb) were prepared, and their band structures and thermoelectric properties were investigated. The peak ZTs of SrAgSb, EuAgSb, and EuCuSb reach ∼0.5, ∼0.35, and ∼0.3 at 773 K. The carrier concentration of SrxAgSb was subsequently optimized by Sr self-doping. The increased Sr content suppresses the intrinsic hole concentration and leads to decreased total thermal conductivity. Together with the comparable power factor, a peak ZT of ∼0.6 was achieved at 773 K for Sr1.01AgSb and Sr1.02AgSb. The discovery of these ZrBeSi-type Zintl-phase thermoelectric materials provides a new family for exploring higher ZT.

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