Electronic and thermoelectric properties of Mg2GexSn1-x (x=0.25, 0.50, 0.75) solid solutions by first-principles calculations

doi:10.1088/1674-1056/26/6/066103

Abstract

The electronic structure and thermoelectric (TE) properties of Mg₂Ge_xSn_1-x (x=0.25, 0.50, 0.75) solid solutions are investigated by first-principles calculations and semi-classical Boltzmann theory. The special quasi-random structure (SQS) is used to model the solid solutions, which can produce reasonable band gaps with respect to experimental results. The n-type solid solutions have an excellent thermoelectric performance with maximum zT values exceeding 2.0, where the combination of low lattice thermal conductivity and high power factor (PF) plays an important role. These values are higher than those of pure Mg₂Sn and Mg₂Ge. The p-type solid solutions are inferior to the n-type ones, mainly due to the much lower PF. The maximum zT value of 0.62 is predicted for p-type Mg₂Ge_0.25Sn_0.75 at 800 K. The results suggest that the n-type Mg₂Ge_xSn_1-x solid solutions are promising mid-temperature TE materials.

Keywords: solid solution electronic structure thermoelectric transport property

Received: 18 January 2017
Revised: 04 March 2017
Accepted manuscript online:

PACS:	61.50.-f	(Structure of bulk crystals)
	74.25.fc	(Electric and thermal conductivity)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 11647010) and the Foundation from the Higher Education and High-quality and World-class Universities (Grant No. PY201611).

Corresponding Authors: Yong Lu, Xiao-hong Shao
E-mail: luy@mail.buct.edu.cn;shaoxh@mail.buct.edu.cn

Cite this article:

Kai-yue Li(李开跃), Yong Lu(鲁勇), Yan Huang(黄艳), Xiao-hong Shao(邵晓红) Electronic and thermoelectric properties of Mg₂Ge_xSn_1-x (x=0.25, 0.50, 0.75) solid solutions by first-principles calculations 2017 Chin. Phys. B 26 066103

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Electronic and thermoelectric properties of Mg2GexSn1-x (x=0.25, 0.50, 0.75) solid solutions by first-principles calculations

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Electronic and thermoelectric properties of Mg₂Ge_xSn_1-x (x=0.25, 0.50, 0.75) solid solutions by first-principles calculations