Issue 40, 2015

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

Abstract

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.

Graphical abstract: Thermoelectric transport and microstructure of optimized Mg2Si0.8Sn0.2

Supplementary files

Article information

Article type
Paper
Submitted
28 mai 2015
Accepted
09 jul 2015
First published
09 jul 2015
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. C, 2015,3, 10467-10475

Author version available

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

J. de Boor, S. Gupta, H. Kolb, T. Dasgupta and E. Müller, J. Mater. Chem. C, 2015, 3, 10467 DOI: 10.1039/C5TC01535A

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