Plastic Mg3(Sb,Bi)2-based thermoelectric compounds with enhanced texture via cold-deformation

Zhang, Ziming; Gao, Zhiqiang; Deng, Tingting; Song, Qingfeng; Chen, Lidong; Bai, Shengqiang

doi:10.1039/d4ta00161c

J. Mater. Chem. A

2024

DOI: 10.1039/d4ta00161c

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Plastic Mg₃(Sb,Bi)₂-based thermoelectric compounds with enhanced texture via cold-deformation

Ziming Zhang,

Zhiqiang Gao,

Tingting Deng

et al.

Abstract: Mg3(Sb,Bi)2-based Zintl compounds have attracted lots of attention due to its high thermoelectric performance and good mechanical property. However, thermally activated mobility, which is ascribed to the grain boundary scattering,...

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Cited by 7 publications

References 62 publications

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Na/Bi-co-doping and heterogeneous interfaces leading to enhanced thermoelectric performance of p-type Mg3Sb2-based Zintls

Xu,

Shi,

Zhang

et al. 2024

Chemical Engineering Journal

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Na/Bi-co-doping and heterogeneous interfaces leading to enhanced thermoelectric performance of p-type Mg3Sb2-based Zintls

Xu,

Shi,

Zhang

et al. 2024

Chemical Engineering Journal

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Advances and challenges in inorganic bulk-based flexible thermoelectric devices

Liu,

Shi,

Cao

et al. 2025

Progress in Materials Science

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High performance magnesium-based plastic semiconductors for flexible thermoelectrics

Li,

Wang,

et al. 2024

Nat Commun

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Low-cost thermoelectric materials with simultaneous high performance and superior plasticity at room temperature are urgently demanded due to the lack of ever-lasting power supply for flexible electronics. However, the inherent brittleness in conventional thermoelectric semiconductors and the inferior thermoelectric performance in plastic organics/inorganics severely limit such applications. Here, we report low-cost inorganic polycrystalline Mg3Sb0.5Bi1.498Te0.002, which demonstrates a remarkable combination of large strain (~ 43%) and high figure of merit zT (~ 0.72) at room temperature, surpassing both brittle Bi2(Te,Se)3 (strain ≤ 5%) and plastic Ag2(Te,Se,S) and organics (zT ≤ 0.4). By revealing the inherent high plasticity in Mg3Sb2 and Mg3Bi2, capable of sustaining over 30% compressive strain in polycrystalline form, and the remarkable deformability of single-crystalline Mg3Bi2 under bending, cutting, and twisting, we optimize the Bi contents in Mg3Sb2-xBix (x = 0 to 1) to simultaneously boost its room-temperature thermoelectric performance and plasticity. The exceptional plasticity of Mg3Sb2-xBix is further revealed to be brought by the presence of a dense dislocation network and the persistent Mg-Sb/Bi bonds during slipping. Leveraging its high plasticity and strength, polycrystalline Mg3Sb2-xBix can be easily processed into micro-scale dimensions. As a result, we successfully fabricate both in-plane and out-of-plane flexible Mg3Sb2-xBix thermoelectric modules, demonstrating promising power density. The inherent remarkable plasticity and high thermoelectric performance of Mg3Sb2-xBix hold the potential for significant advancements in flexible electronics and also inspire further exploration of plastic inorganic semiconductors.

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Plastic Mg₃(Sb,Bi)₂-based thermoelectric compounds with enhanced texture via cold-deformation

Abstract: Mg3(Sb,Bi)2-based Zintl compounds have attracted lots of attention due to its high thermoelectric performance and good mechanical property. However, thermally activated mobility, which is ascribed to the grain boundary scattering,...

Cited by 7 publications

References 62 publications

Na/Bi-co-doping and heterogeneous interfaces leading to enhanced thermoelectric performance of p-type Mg3Sb2-based Zintls

Na/Bi-co-doping and heterogeneous interfaces leading to enhanced thermoelectric performance of p-type Mg3Sb2-based Zintls

Advances and challenges in inorganic bulk-based flexible thermoelectric devices

High performance magnesium-based plastic semiconductors for flexible thermoelectrics

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