Bi-Deficiency Leading to High-Performance in Mg3(Sb,Bi)2-Based Thermoelectric Materials

Jing Wei Li; Weishu Liu; Wei Xu; Hua Lu Zhuang; Zhijia Han; Feng Jiang; Peng Zhang; Haihua Hu; Hanbin Gao; Yilin Jiang; Bowen Cai; Jun Pei; Bin Su; Qian Li; Kei Hayashi; Hezhang Li; Yuzuru Miyazaki; Xingzhong Cao; Qiang Zheng; Jing Feng Li

doi:10.1002/adma.202209119

Bi-Deficiency Leading to High-Performance in Mg₃(Sb,Bi)₂-Based Thermoelectric Materials

Jing Wei Li, Weishu Liu^*, Wei Xu, Hua Lu Zhuang, Zhijia Han, Feng Jiang, Peng Zhang, Haihua Hu, Hanbin Gao, Yilin Jiang, Bowen Cai, Jun Pei, Bin Su, Qian Li, Kei Hayashi, Hezhang Li, Yuzuru Miyazaki, Xingzhong Cao^*, Qiang Zheng^*, Jing Feng Li^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

Mg₃(Sb,Bi)₂ is a potential nearly-room temperature thermoelectric compound composed of earth-abundant elements. However, complex defect tuning and exceptional microstructural control are required. Prior studies have confirmed the detrimental effect of Mg vacancies (V_Mg) in Mg₃(Sb,Bi)₂. This study proposes an approach to mitigating the negative scattering effect of V_Mg by Bi deficiency, synergistically modulating the electrical and thermal transport properties to enhance the thermoelectric performance. Positron annihilation spectrometry and C_s-corrected scanning transmission electron microscopy analyses indicated that the V_Mg tends to coalesce due to the introduced Bi vacancies (V_Bi). The defects created by Bi deficiency effectively weaken the scattering of electrons from the intrinsic V_Mg and enhance phonon scattering. A peak zT of 1.82 at 773 K and high conversion efficiency of 11.3% at ∆T = 473 K are achieved in the optimized composition of Mg₃(Sb,Bi)₂ by tuning the defect combination. This work demonstrates a feasible and effective approach to improving the performance of Mg₃(Sb,Bi)₂ as an emerging thermoelectric material.

Original language	English
Article number	2209119
Journal	Advanced Materials
Volume	35
Issue number	23
DOIs	https://doi.org/10.1002/adma.202209119
Publication status	Published - 8 Jun 2023
Externally published	Yes

Keywords

Mg(Sb,Bi)
defect engineering
lattice thermal conductivity
thermoelectric materials

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10.1002/adma.202209119

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Li, J. W., Liu, W., Xu, W., Zhuang, H. L., Han, Z., Jiang, F., Zhang, P., Hu, H., Gao, H., Jiang, Y., Cai, B., Pei, J., Su, B., Li, Q., Hayashi, K., Li, H., Miyazaki, Y., Cao, X., Zheng, Q., & Li, J. F. (2023). Bi-Deficiency Leading to High-Performance in Mg₃(Sb,Bi)₂-Based Thermoelectric Materials. Advanced Materials, 35(23), Article 2209119. https://doi.org/10.1002/adma.202209119

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title = "Bi-Deficiency Leading to High-Performance in Mg3(Sb,Bi)2-Based Thermoelectric Materials",

abstract = "Mg3(Sb,Bi)2 is a potential nearly-room temperature thermoelectric compound composed of earth-abundant elements. However, complex defect tuning and exceptional microstructural control are required. Prior studies have confirmed the detrimental effect of Mg vacancies (VMg) in Mg3(Sb,Bi)2. This study proposes an approach to mitigating the negative scattering effect of VMg by Bi deficiency, synergistically modulating the electrical and thermal transport properties to enhance the thermoelectric performance. Positron annihilation spectrometry and Cs-corrected scanning transmission electron microscopy analyses indicated that the VMg tends to coalesce due to the introduced Bi vacancies (VBi). The defects created by Bi deficiency effectively weaken the scattering of electrons from the intrinsic VMg and enhance phonon scattering. A peak zT of 1.82 at 773 K and high conversion efficiency of 11.3% at ∆T = 473 K are achieved in the optimized composition of Mg3(Sb,Bi)2 by tuning the defect combination. This work demonstrates a feasible and effective approach to improving the performance of Mg3(Sb,Bi)2 as an emerging thermoelectric material.",

keywords = "Mg(Sb,Bi), defect engineering, lattice thermal conductivity, thermoelectric materials",

author = "Li, {Jing Wei} and Weishu Liu and Wei Xu and Zhuang, {Hua Lu} and Zhijia Han and Feng Jiang and Peng Zhang and Haihua Hu and Hanbin Gao and Yilin Jiang and Bowen Cai and Jun Pei and Bin Su and Qian Li and Kei Hayashi and Hezhang Li and Yuzuru Miyazaki and Xingzhong Cao and Qiang Zheng and Li, {Jing Feng}",

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doi = "10.1002/adma.202209119",

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AU - Li, Jing Wei

AU - Liu, Weishu

AU - Xu, Wei

AU - Zhuang, Hua Lu

AU - Han, Zhijia

AU - Jiang, Feng

AU - Zhang, Peng

AU - Hu, Haihua

AU - Gao, Hanbin

AU - Jiang, Yilin

AU - Cai, Bowen

AU - Pei, Jun

AU - Su, Bin

AU - Li, Qian

AU - Hayashi, Kei

AU - Li, Hezhang

AU - Miyazaki, Yuzuru

AU - Cao, Xingzhong

AU - Zheng, Qiang

AU - Li, Jing Feng

PY - 2023/6/8

Y1 - 2023/6/8

N2 - Mg3(Sb,Bi)2 is a potential nearly-room temperature thermoelectric compound composed of earth-abundant elements. However, complex defect tuning and exceptional microstructural control are required. Prior studies have confirmed the detrimental effect of Mg vacancies (VMg) in Mg3(Sb,Bi)2. This study proposes an approach to mitigating the negative scattering effect of VMg by Bi deficiency, synergistically modulating the electrical and thermal transport properties to enhance the thermoelectric performance. Positron annihilation spectrometry and Cs-corrected scanning transmission electron microscopy analyses indicated that the VMg tends to coalesce due to the introduced Bi vacancies (VBi). The defects created by Bi deficiency effectively weaken the scattering of electrons from the intrinsic VMg and enhance phonon scattering. A peak zT of 1.82 at 773 K and high conversion efficiency of 11.3% at ∆T = 473 K are achieved in the optimized composition of Mg3(Sb,Bi)2 by tuning the defect combination. This work demonstrates a feasible and effective approach to improving the performance of Mg3(Sb,Bi)2 as an emerging thermoelectric material.

AB - Mg3(Sb,Bi)2 is a potential nearly-room temperature thermoelectric compound composed of earth-abundant elements. However, complex defect tuning and exceptional microstructural control are required. Prior studies have confirmed the detrimental effect of Mg vacancies (VMg) in Mg3(Sb,Bi)2. This study proposes an approach to mitigating the negative scattering effect of VMg by Bi deficiency, synergistically modulating the electrical and thermal transport properties to enhance the thermoelectric performance. Positron annihilation spectrometry and Cs-corrected scanning transmission electron microscopy analyses indicated that the VMg tends to coalesce due to the introduced Bi vacancies (VBi). The defects created by Bi deficiency effectively weaken the scattering of electrons from the intrinsic VMg and enhance phonon scattering. A peak zT of 1.82 at 773 K and high conversion efficiency of 11.3% at ∆T = 473 K are achieved in the optimized composition of Mg3(Sb,Bi)2 by tuning the defect combination. This work demonstrates a feasible and effective approach to improving the performance of Mg3(Sb,Bi)2 as an emerging thermoelectric material.

KW - Mg(Sb,Bi)

KW - defect engineering

KW - lattice thermal conductivity

KW - thermoelectric materials

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Bi-Deficiency Leading to High-Performance in Mg₃(Sb,Bi)₂-Based Thermoelectric Materials

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