Thermoelectric transport and microstructure of optimized Mg2Si0.8Sn0.2

被引：42
作者：
de Boor, J. [1 ]
Gupta, S. [1 ]
Kolb, H. [1 ]
Dasgupt, T. [2 ]
Mueller, E. [1 ,3 ]
机构：
[1] German Aerosp Ctr, Inst Mat Res, D-51147 Cologne, Germany
[2] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India
[3] Univ Giessen, Inst Inorgan & Analyt Chem, D-35392 Giessen, Germany
来源：
JOURNAL OF MATERIALS CHEMISTRY C | 2015年 / 3卷 / 40期
关键词：
LATTICE VIBRATION FREQUENCIES; ELASTIC-CONSTANTS; MG2SI; FABRICATION;
D O I：
10.1039/c5tc01535a
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Solid solutions of magnesium silicide and magnesium stannide exhibit excellent thermoelectric properties due to favorable electronic band structures and reduced thermal conductivity compared to the binary compounds. We have optimized the composition Mg2Si0.8Sn0.2 by Sb doping and obtained a thermoelectric figure of merit close to unity. The material comprises of several phases and exhibits intrinsic nanostructuring. Nevertheless, the main features of electronic transport can be understood within the framework of a single parabolic band model. Compared to Mg2Si we observe a comparable power factor, a drastically reduced thermal conductivity and an increased effective mass.
引用
收藏
页码：10467 / 10475
页数：9
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