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Journal of Advanced Ceramics 2021, 10(2): 377-384 https://doi.org/10.1007/s40145-021-0462-5
Rapid Communication | Open Access | Issue | Published: 29 January 2021

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

Show Author's Information Yunpeng ZHENGa,  Mingchu ZOUa,  Wenyu ZHANGa,  Di YIa,  Jinle LANb,  Ce-Wen NANa,  Yuan-Hua LINa( )
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
Keywords:
high entropy, thermoelectric oxides, thermal conductivity, electrical conductivity, oxygen vacancy
Cite this article:
ZHENG Y, ZOU M, ZHANG W, et al. Electrical and thermal transport behaviours of high-entropy perovskite thermoelectric oxides. Journal of Advanced Ceramics, 2021, 10(2): 377-384. https://doi.org/10.1007/s40145-021-0462-5
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Abstract Full text About this article

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 SrTiO3-based thermoelectric ceramics via high-entropy strategy for the first time, and optimized electrical conductivity by defect engineering. In high-entropy (Ca0.2Sr0.2Ba0.2Pb0.2La0.2)TiO3 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 295 μW/(m·K2) 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.


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About this article

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

Show Author's information Yunpeng ZHENGa, Mingchu ZOUa, Wenyu ZHANGa, Di YIa, Jinle LANb, Ce-Wen NANa, Yuan-Hua LINa( )
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China

Abstract

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 SrTiO3-based thermoelectric ceramics via high-entropy strategy for the first time, and optimized electrical conductivity by defect engineering. In high-entropy (Ca0.2Sr0.2Ba0.2Pb0.2La0.2)TiO3 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 295 μW/(m·K2) 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.

Keywords: high entropy, thermoelectric oxides, thermal conductivity, electrical conductivity, oxygen vacancy

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Publication history
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Publication history

Received: 15 January 2021
Accepted: 21 January 2021
Published: 29 January 2021
Issue date: April 2021

Copyright

© The Author(s) 2021

Acknowledgements

We thank Yu Xiao from Beihang University for samples’ thermal conductivity measurements. This work was 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, and the National Natural Science Foundation of China under Grant No. 51729201.

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