Electrical and thermal transport behaviours of high-entropy perovskite thermoelectric oxides

查看全文 作　　者：Yunpeng [1]Zheng;Mingchu [1]Zou;Wenyu [1]Zhang;Di [1]Yi;Jinle [2]Lan;Ce-Wen [1]Nan;Yuan-Hua [1]Lin

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China;[2]State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing,100029,China

出　　处：《Journal of Advanced Ceramics》索引2021年第10卷第2期,共8页

基　　金：financially supported by Basic Science Center Project of the National Natural Science Foundation of China under Grant No.51788104;National Key Research Program of China under Grant No.2016YFA0201003;the National Natural Science Foundation of China under Grant No.51729201。 摘　　要：Oxide-based ceramics could be promising thermoelectric materials because of their thermal and chemical stability at high temperature.However,their mediocre electrical conductivity or high thermal conductivity is still a challenge for the use in commercial devices.Here,we report significantly suppressed thermal conductivity in SrTiO_(3)-based thermoelectric ceramics via high-entropy strategy for the first time,and optimized electrical conductivity by defect engineering.In high-entropy(Ca_(0.2)Sr_(0.2)Ba_(0.2)Pb_(0.2)La_(0.2))TiO_(3)bulks,the minimum thermal conductivity can be 1.17 W/(m·K)at 923 K,which should be ascribed to the large lattice distortion and the huge mass fluctuation effect.The power factor can reach about 295μW/(m·K^(2))by inducing oxygen vacancies.Finally,the ZT value of 0.2 can be realized at 873 K in this bulk sample.This approach proposed a new concept of high entropy into thermoelectric oxides,which could be generalized for designing high-performance thermoelectric oxides with low thermal conductivity. 关键词：high entropy thermoelectric oxides thermal conductivity electrical conductivity oxygen vacancy

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Electrical and thermal transport behaviours of high-entropy perovskite thermoelectric oxides

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