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Effect of thermal history on the properties of efficient thermoelectric alloys Ge0.86Pb0.1Bi0.04Te*
Russian version
DOI: 10.21883/SC.2022.03.53053.34
Shabaldin A. A. 1, Samunin A.Yu.1, Konstantinov P.P1, Novikov S.V.1, Burkov A.T. 1, Bu Zhonglin 2, Pei Yanzhong 2
1Ioffe Institute, St. Petersburg, Russia
2Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Tongji University, Shanghai, China
Email: berrior@rambler.ru, samunin@yandex.ru, p.konstantinov@mail.ioffe.ru, s.novokov@mail.ioffe.ru, a.burkov@mail.ioffe.ru, zhonglinbu@foxmail.com, yanzhong@tongji.edu.cn
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In this work, we study thermoelectric properties of GeTei-based alloys, doped with bismuth, with partial substitution of lead for germanium: Ge0.86Pb0.1Bi0.04Te. The aim of the study is to explore the possibility of increasing the thermoelectric efficiency of a compound by combining optimal doping and isovalent substitution to improve the electronic properties with a simultaneous decrease of the lattice thermal conductivity. We studied alloy samples prepared in two different research laboratories using similar, but not completely identical procedures. It is shown that the electronic (thermoelectric power and electrical conductivity) properties of the samples of the two groups are in good agreement with each other. The properties of alloys depend on the thermal history of the samples due to the presence at temperatures of 600-800 K of a phase transition from a low-temperature rhombohedral to a high-temperature cubic structural modification and missibility gap in GeTe-PbTe quasibinary system below 870 K. The thermoelectric figure of merit of alloys reaches a maximum value of 1.5 at a temperature of about 750 K. Keywords: thermoelectric alloys, thermoelectric power, electrical conductivity, thermal conductivity
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