Thermoelectric properties of BixSb2-xTe3 alloy with layered microstructure optimized by microwave hot pressing
LIU Peihai1,2, FENG Bo1,2, HU Xiaoming1,2, LI Rusong1,2, ZHANG Yanglin1,2, FAN Xi'an1,2
1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China; 2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
Abstract：The p-type BixSb2-xTe3 alloys with hierarchical microstructures were prepared by mechanical alloying and a new sintering technique of microwave activated hot pressing (MAHP). The effects of Bi content on the microstructure and thermoelectric properties of BixSb2-xTe3 alloy were studied. The results show that there are irregular nanoparticles, which are in-situ nanostructures caused by microwave arc effect. With increasing Bi content, the electrical resistivity and Seebeck coefficient increase due to the obvious decrease of carrier concentration. At the same time, the lattice thermal conductivity increases due to the decrease in the amount of irregular nanograins. BixSb2-xTe3 has a maximum power factor of 3.81 mW/(m·K2) and a minimum lattice thermal conductivity of 0.33 W/(m·K), so as to obtain the maximum dimensionless figure of merit value of 1.23 at 70 ℃. The MAHP technique introduced in this work has achieved a significant improvement in the thermoelectric properties of the BixSb2-xTe3 alloy.
刘培海, 冯波, 胡晓明, 李如松, 张阳琳, 樊希安. 微波热压优化分层微观结构BixSb2-xTe3合金的热电性能[J]. 粉末冶金材料科学与工程, 2020, 25(3): 213-220.
LIU Peihai, FENG Bo, HU Xiaoming, LI Rusong, ZHANG Yanglin, FAN Xi'an. Thermoelectric properties of BixSb2-xTe3 alloy with layered microstructure optimized by microwave hot pressing. Materials Science and Engineering of Powder Metallurgy, 2020, 25(3): 213-220.
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2020, Vol. 25 
