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Chin. Phys. B, 2017, Vol. 26(6): 066103    DOI: 10.1088/1674-1056/26/6/066103
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

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

Kai-yue Li(李开跃), Yong Lu(鲁勇), Yan Huang(黄艳), Xiao-hong Shao(邵晓红)
College of Science, Beijing University of Chemical Technology, Beijing 100029, China
Abstract  

The electronic structure and thermoelectric (TE) properties of Mg2GexSn1-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 Mg2Ge0.25Sn0.75 at 800 K. The results suggest that the n-type Mg2GexSn1-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 Mg2GexSn1-x (x=0.25, 0.50, 0.75) solid solutions by first-principles calculations 2017 Chin. Phys. B 26 066103

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