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Research Article | Open Access

Electrical property enhancement and lattice thermal conductivity reduction of n-type Mg3Sb1.5Bi0.5-based Zintl compound by In&Se co-doping

Tong Liua, Jiansong Liaoa, Hang Liua, Runyu Wanga, Guocai Yuana, Jing Jiangb, Yi Niub, Xiaobo Leia, Lihong Huanga( ), Chao Wangb( ), Qinyong Zhanga( )
Key Laboratory of Fluid and Power Machinery of Ministry of Education, School of Materials Science & Engineering, Xihua University, Chengdu, 610039, China
Clean Energy Materials and Engineering Center, State Key Laboratory of Electronic Thin Film and Integrated Device, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China

Peer review under responsibility of The Chinese Ceramic Society.

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Graphical Abstract

Abstract

Mg3Sb1.5Bi0.5-based Zintl compounds have attracted extensive attention as potential thermoelectric materials due to their earth-abundant elements. However, pure and intrinsic Mg3Sb1.5Bi0.5 manifests a poor thermoelectric performance because of its low electrical conductivity of about 3 × 102 S/m at room temperature. In this work, In and Se co-doping was carried out to optimize the thermoelectric performance of n-type Mg3Sb1.5Bi0.5-based material. The experimental results revealed that the carrier concentration and mobility of Mg3Sb1.5Bi0.5 significantly increased after In and Se co-doping, leading to an improvement of power factor. Simultaneously, lattice thermal conductivity was significantly reduced due to the large mass difference between In and Mg. A maximum zT of 1.64 at 723 K was obtained for the Mg3.17In0.03Sb1.5Bi0.49Se0.01 sample. And an average zT value of about 1.1 between 300 and 723 K was achieved, which insures its possible application at medium temperature range as a non-toxic and low-cost TE material.

Keywords

Zintl compoundThermoelectric propertyn-type Mg3Sb1.5Bi0.5In&Se co-doping

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Journal of Materiomics
Volume 9 Issue 3,
May 2023
Pages 431-437
DOI: 10.1016/j.jmat.2022.11.012
Cite this article:
Liu T, Liao J, Liu H, et al. Electrical property enhancement and lattice thermal conductivity reduction of n-type Mg3Sb1.5Bi0.5-based Zintl compound by In&Se co-doping. Journal of Materiomics, 2023, 9(3): 431-437. https://doi.org/10.1016/j.jmat.2022.11.012

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Received: 10 October 2022
Revised: 04 November 2022
Accepted: 24 November 2022
Published: 29 January 2023
© 2023 The Authors.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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