期刊
MATERIALS TODAY PHYSICS
卷 21, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtphys.2021.100508
关键词
Thermoelectrics; Mg3Sb2; Single crystals; Electronic and thermal properties
资金
- National Natural Science Foundation of China [52001231, 51861145305, 51772215]
- China Postdoctoral Science Foundation Projects [2019TQ0228, 2019M661612]
This study focuses on the anisotropy of transport properties in n-type Mg3Sb2, revealing nearly isotropic transport properties in centimeter-sized single crystals, and uncovering the origins of low lattice thermal conductivity and superior electronic performance in the material.
As a top candidate for competing with the conventional n-Bi2Te3 thermoelectrics, Mg3Sb2-based materials have attracted increasing attentions for low-grade (<300 degrees C) waste heat recovery applications, due to the high thermoelectric performance, low cost, abundance and nontoxicity. Because of its anisotropic crystal structure as that of Bi2Te3, possible property anisotropy and the resultant similar requirement of texturing for preferential performance remain not entirely clear Mg3Sb2-thermoelectrics at working temperatures. This motivates the current work to focus on the transport-property anisotropy of n-type Mg3Sb2, centimeter-sized single crystals of which are successfully grown by a flux-assisted vertical Bridgman technique with a post-annealing under a Mg vapor pressure. This enables a revelation of nearly isotropic transport properties in this anisotropically structured material, guaranteeing reasonably high performances in polycrystalline materials achievable by cheap and scalable processing approaches such as powder-metallurgy. In addition, this work uncovers the strong lattice anharmonicity and large band degeneracy are respectively the origins for the low lattice thermal conductivity and superior electronic performance. (C) 2021 Elsevier Ltd. All rights reserved.
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