Thermoelectric performance of quaternary Mg2(1+x)Si0.2Ge0.1Sn0.7 (0.06 ≤ x ≤ 0.12) solid solutions with band convergence

被引：15
作者：
Du, Z. L. [1 ]
Gao, H. L. [2 ]
Cui, J. L. [1 ]
机构：
[1] Ningbo Univ Technol, Sch Mat Sci & Engn, Ningbo 315016, Zhejiang, Peoples R China
[2] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
来源：
CURRENT APPLIED PHYSICS | 2015年 / 15卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Thermoelectric materials; Mg-2(Si; Ge; Sn) solid solution; Band convergence; BI; MG;
D O I：
10.1016/j.cap.2015.04.034
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The study of Mg2Si based thermoelectric materials has received widespread attention. In this research, quaternary Mg2(1+x)(Si0.2Ge0.1Sn0.7)(0.99)Sb-0.01 (0.06 <= x <= 0.12) solid solutions with an optimized Sb doping were prepared by B2O3 flux method combined with spark plasma sintering ( SPS) technique. The Seebeck coefficient, electrical conductivity and thermal conductivity were measured as a function of Mg excess between 300 K and 780 K. The electron concentration, electrical conductivity and lattice thermal conductivity increase while the Seebeck coefficient decreases with increasing magnesium excess content. The electron effective mass enhancement for x >= 0.08 suggests the conduction band convergence of Mg2Si0.2Ge0.1Sn0.7. Mg-2.16(Si0.2Ge0.1Sn0.7)(0.99)Sb-0.01 with a maximum dimensionless figure of merit of 0.94 at 780 K stand out as one of the best materials for intermediate temperature applications, providing a good nontoxic alternative to PbTe. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：784 / 788
页数：5
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