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Thermoelectricity of n-type MnBi4S7-7xSe7x solid solution
Xi, Ming1; Zhu, Huaxing1; Wu, Hong1,2,3; Yang, Yibin1; Yan, Yanci1; Wang, Guoyu2,3; Wang, Guiwen4; Li, JiangYu5; Lu, Xu1; Zhou, Xiaoyuan1,4
2020-09-15
摘要We report self-doped MnBi4S7-xSe7x solid solution as a novel n-type sulfide thermoelectric material with weak anisotropic transport properties. These compounds feature intrinsically low lattice thermal conductivity of 0.5-0.8 W m(-1)K(-1) in the temperature range of 300-800 K, which is well explained by strong lattice anharmonic vibration, mainly from Bi atoms as verified by theoretical calculations. Intentionally introduced sulfur deficiency acts as an efficient electron donor that enhances the electrical conductivity of MnBi4S7 while alloying with Se can promote electrical conductivity and further reduce thermal conductivity by 25% in the whole temperature region. As a result, the sample of with nominal composition of MnBi4S5.46Se1.4 shows a peak zT of similar to 0.31 at 770 K vertical to the pressing direction.
关键词Eco-friendly Thermoelectric Low lattice thermal conductivity Anharmonicity n-type sulfides
DOI10.1016/j.cej.2020.125219
发表期刊CHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
卷号396页码:9
通讯作者Lu, Xu(luxu@cqu.edu.cn) ; Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000551969200049
语种英语