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Chin. Phys. B, 2020, Vol. 29(6): 067201    DOI: 10.1088/1674-1056/ab84cd
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Significant role of nanoscale Bi-rich phase in optimizing thermoelectric performance of Mg3Sb2

Yang Wang(王杨)1, Xin Zhang(张忻)1, Yan-Qin Liu(刘燕琴)1, Jiu-Xing Zhang(张久兴)2, Ming Yue(岳明)1
1 Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
2 School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
Abstract  Mg3Sb1.5Bi0.5-based alloys have received much attention, and current reports on this system mainly focus on the modulation of doping. However, there lacks the explanation for the choice of Mg3Sb1.5Bi0.5 as matrix. Here in this work, the thermoelectric properties of Mg3Sb2-xBix (0.4 ≤ x ≤ 0.55) compounds are systematically investigated by using the first principles calculation combined with experiment. The calculated results show that the band gap decreases after Bi has been substituted for Sb site, which makes the thermal activation easier. The maximum figure of merit (ZT) is 0.27 at 773 K, which is attributed to the ultra-low thermal conductivity 0.53 W·m-1·K-1 for x=0.5. The large mass difference between Bi and Sb atoms, the lattice distortion induced by substituting Bi for Sb, and the nanoscale Bi-rich particles distributed on the matrix are responsible for the reduction of thermal conductivity. The introduction of Bi into Mg3Sb2-based materials plays a vital role in regulating the transport performance of thermoelectric materials.
Keywords:  first principles calculations      nanoscale Bi-rich phase      Mg3Sb2      thermoelectric performance  
Received:  20 December 2019      Revised:  23 March 2020      Published:  05 June 2020
PACS:  72.20.Pa (Thermoelectric and thermomagnetic effects)  
  73.50.Lw (Thermoelectric effects)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51371010, 51572066, and 50801002), the Beijing Municipal Natural Science Foundation, China (Grant No. 2112007), the Fundamental Research Funds for the Central Universities (Grant No. PXM2019-014204-500032), and the Science Fund from the Advanced Space Propulsion Laboratory of BICE and Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology, China (Grant No. LabASP-2018-09).
Corresponding Authors:  Xin Zhang     E-mail:  zhxin@bjut.edu.cn

Cite this article: 

Yang Wang(王杨), Xin Zhang(张忻), Yan-Qin Liu(刘燕琴), Jiu-Xing Zhang(张久兴), Ming Yue(岳明) Significant role of nanoscale Bi-rich phase in optimizing thermoelectric performance of Mg3Sb2 2020 Chin. Phys. B 29 067201

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