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Investigation of Al substitution on the thermoelectric properties of SrSi_2

机译：Al替代对SrSi_2热电性能的影响

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摘要

We report the results of aluminum substitution on the temperature-dependent electrical resistivity, Seebeck coefficient, as well as thermal conductivity of SrSi_(2-x)Al_x alloys with 0 ≤ x ≤ 0.20. It is found that the substitution of Al onto the Si sites of SrSi_2 causes a significant decrease in the electrical resistivity and the Seebeck coefficient. The observations are associated with the downward shift of the Fermi level, due to hole-doping via Al substitution within a rigid-band scenario. The low-temperature thermal conductivity decreases markedly with increasing Al content. Analysis of the lattice thermal conductivity from the contribution of various thermal scattering mechanisms reveals that the reduction in the lattice thermal conductivity mainly arises from the grain-boundary and point-defect scattering of the phonons through chemical substitution.
机译：我们报告了铝替代的结果，该电阻取决于温度的电阻率，塞贝克系数以及0≤x≤0.20的SrSi_（2-x）Al_x合金的热导率。发现在SrSi_2的Si位点上Al的取代引起电阻率和塞贝克系数的显着降低。观察结果与费米能级的下降有关，这归因于在刚性频带中通过Al替代进行的空穴掺杂。低温热导率随着Al含量的增加而显着降低。从各种热散射机制的贡献来分析晶格热导率表明，晶格热导率的降低主要是由于声子通过化学取代的晶界和点缺陷散射所致。

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  • 来源
    《Materials Chemistry and Physics》 |2013年第2期|604-607|共4页
  • 作者

    Y.K. Kuo; C.S. Lue; G. Hsu; J.Y. Huang; H.L. Hsieh;

  • 作者单位

    Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan;

    Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan;

    Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan;

    New Material Research & Development Department, China Steel Corporation, Kaohsiung 81233, Taiwan;

    New Material Research & Development Department, China Steel Corporation, Kaohsiung 81233, Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A. Alloys; B. Arc discharges; D. Thermal properties; D. Transport properties;

    机译：A.合金B.电弧放电;D.热性能;D.运输性质;

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