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首页> 外文期刊>Advanced energy materials >Tuning Multiscale Microstructures to Enhance Thermoelectric Performance of n-Type Bismuth-Telluride-Based Solid Solutions
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Tuning Multiscale Microstructures to Enhance Thermoelectric Performance of n-Type Bismuth-Telluride-Based Solid Solutions

机译：调整多尺度微结构以增强n型基于碲化铋的固溶体的热电性能

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摘要

Microstructure manipulation plays an important role in enhancing physical and mechanical properties of materials. Here a high figure of merit zT of 1.2 at 357 K for n-type bismuth-telluride-based thermoelectric (TE) materials through directly hot deforming the commercial zone melted (ZM) ingots is reported. The high TE performance is attributed to a synergistic combination of reduced lattice thermal conductivity and maintained high power factor. The lattice thermal conductivity is substantially decreased by broad wavelength phonon scattering via tuning multiscale microstructures, which includes microscale grain size reduction and texture loss, nanoscale distorted regions, and atomic scale lattice distotions and point defects. The high power factor of ZM ingots is maintained by the offset between weak donor-like effect and texture loss during the hot deformation. The resulted high zT highlights the role of multiscale microstructures in improving Bi2Te3-based materials and demonstrates the effective strategy in enhancing TE properties.
机译：微结构操纵在增强材料的物理和机械性能方面起着重要作用。此处报道了通过直接热变形市售区域熔化（ZM）铸锭使n型基于碲化铋的热电（TE）材料在357 K处的高品质因数zT为1.2。高TE性能归因于降低的晶格导热率和维持的高功率因数的协同组合。晶格热导率通过调谐多尺度微结构而通过宽波长声子散射而大大降低，这包括微尺度晶粒尺寸的减小和纹理损失，纳米尺度扭曲的区域以及原子尺度晶格畸变和点缺陷。 ZM铸锭的高功率因数通过在热变形过程中弱的施主效应和质地损失之间的偏移来保持。所得的高zT值突出了多尺度微结构在改善Bi2Te3基材料中的作用，并证明了增强TE性能的有效策略。

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  • 来源
    《Advanced energy materials》 |2015年第17期|1-13|共13页
  • 作者

    Lipeng Hu; Haijun Wu; Tiejun Zhu; Chenguang Fu; Jiaqing He; Pingjun Ying; Xinbing Zhao;

  • 作者单位

    State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou China;

    State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou China;

    Department of Physics and Shenzhen Key Laboratory of Thermoelectric Materials South University of Science and Technology of China Shenzhen China;

    State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou China;

    Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Zhejiang University Hangzhou China;

    State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou China;

    State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou China;

    Department of Physics and Shenzhen Key Laboratory of Thermoelectric Materials South University of Science and Technology of China Shenzhen China;

    State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou China;

    State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou China;

    Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Zhejiang University Hangzhou China;

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  • 正文语种 eng
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  • 关键词

    bismuth telluride; multiscale microstructures; point defects; texture; thermoelectric materials;

    机译：碲化铋;多尺度微结构;点缺陷;纹理;热电材料;

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