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Micromachines
Volume 14
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10.3390/mi14101844
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Article

Effect of Composition Adjustment on the Thermoelectric Properties of Mg3Bi2-Based Thermoelectric Materials

by
Jianbao Yang
1,
Zhibin Wang
1,
Hong Zhao
1,
Xinyu Luo
1,
Wenyuan Han
1,
Hao Wang
1,
Linghao Meng
1,
Xinqi She
1,
Anlong Quan
1,
Yixin Peng
1,
Guoji Cai
2,
Yi Liu
2,
Yong Tang
2 and
Bo Feng
1,2,3,*
1
Institute of Engineering and Technology, Hubei University of Science and Technology, Xianning 437100, China
2
School of Mechanical and Electrical Engineering, Wuhan Donghu University, Wuhan 430070, China
3
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
*
Author to whom correspondence should be addressed.
Micromachines 2023, 14(10), 1844; https://doi.org/10.3390/mi14101844
Submission received: 31 August 2023 / Revised: 15 September 2023 / Accepted: 18 September 2023 / Published: 27 September 2023
(This article belongs to the Special Issue Development of High Performance Thermoelectric Materials towards Applications)
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Abstract

Thermoelectric materials are widely used in refrigeration chips, thermal power generation, catalysis and other fields. Mg3Bi2-based thermoelectric material is one of the most promising thermoelectric materials. Herein, the Mg3Bi2-based samples were prepared by high temperature synthesis, and the influence of Mg/Sb content on the electrical transport properties and semi-conductivity/semi-metallicity of the materials has been studied. The results indicate that the efficiency of introducing electrons from excess Mg prepared by high temperature synthesis is lower than that introduced by ball milling, due to the high vapor pressure of Mg. The doping of Sb/Te at the Bi site would make it easier for the material to change from p-type conduction to n-type conduction. With the increase in Mg content, the semi-conductivity of the material becomes weaker, the semi-metallicity becomes stronger, and the corresponding conductivity increases. With the increase in Sb content, the samples exhibit the opposite changes. The highest power factor of ~1.98 mWm−1K−2 is obtained from the Mg3.55Bi1.27Sb0.7Te0.03 sample.
Keywords: Mg3Bi2; composition adjustment; acceptor effect; thermoelectric properties Mg3Bi2; composition adjustment; acceptor effect; thermoelectric properties

Share and Cite

MDPI and ACS Style

Yang, J.; Wang, Z.; Zhao, H.; Luo, X.; Han, W.; Wang, H.; Meng, L.; She, X.; Quan, A.; Peng, Y.; et al. Effect of Composition Adjustment on the Thermoelectric Properties of Mg3Bi2-Based Thermoelectric Materials. Micromachines 2023, 14, 1844. https://doi.org/10.3390/mi14101844

AMA Style

Yang J, Wang Z, Zhao H, Luo X, Han W, Wang H, Meng L, She X, Quan A, Peng Y, et al. Effect of Composition Adjustment on the Thermoelectric Properties of Mg3Bi2-Based Thermoelectric Materials. Micromachines. 2023; 14(10):1844. https://doi.org/10.3390/mi14101844

Chicago/Turabian Style

Yang, Jianbao, Zhibin Wang, Hong Zhao, Xinyu Luo, Wenyuan Han, Hao Wang, Linghao Meng, Xinqi She, Anlong Quan, Yixin Peng, and et al. 2023. "Effect of Composition Adjustment on the Thermoelectric Properties of Mg3Bi2-Based Thermoelectric Materials" Micromachines 14, no. 10: 1844. https://doi.org/10.3390/mi14101844

APA Style

Yang, J., Wang, Z., Zhao, H., Luo, X., Han, W., Wang, H., Meng, L., She, X., Quan, A., Peng, Y., Cai, G., Liu, Y., Tang, Y., & Feng, B. (2023). Effect of Composition Adjustment on the Thermoelectric Properties of Mg3Bi2-Based Thermoelectric Materials. Micromachines, 14(10), 1844. https://doi.org/10.3390/mi14101844

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