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Largely enhanced thermoelectric properties of the binary-phased PbTe-Sb_2Te_3 nanocomposites

机译：二元相PbTe-Sb_2Te_3纳米复合材料的热电性能大大提高

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摘要

In this article, the binary-phased PbTe-Sb_2Te_3 nanopowders were synthesized via a hydro/solvo-thermal route to improve the thermoelectric properties of PbTe matrix material. The single-phased PbTe powders exhibit pure nanoparticles, but the binary-phased PbTe-Sb_2Te_3 powders have a mixed morphology composed of nanospheres and nanoribbons. Our results suggest that the thermal conductivity of the binary-phased PbTe-Sb_2Te_3 bulks can be reduced significantly and the Seebeck coefficient can be increased obviously, although the electrical conductivity can also be decreased sharply. Consequently, a large figure of merit 0.85 at 623 K can be achieved for 0.7PbTe-0.3Sb_2Te_3 bulk, which is enhanced by about one time as compared to that of the single-phased PbTe bulk. This large enhancement could be attributed to the lowered carrier concentration and the increased interface scattering in the binary-phased PbTe-Sb_2Te_3 materials with a mixed morphology.
机译：本文通过水热/溶剂热法合成了二元相PbTe-Sb_2Te_3纳米粉体，以改善PbTe基材料的热电性能。单相PbTe粉末显示纯纳米颗粒，而二相PbTe-Sb_2Te_3粉末具有由纳米球和纳米带组成的混合形态。我们的结果表明，虽然电导率也可以急剧降低，但二元相PbTe-Sb_2Te_3体的热导率可以显着降低，塞贝克系数可以明显提高。因此，对于0.7PbTe-0.3Sb_2Te_3块体，可以在623 K处获得较大的品质因数0.85，与单相PbTe块体相比，其性能提高了约一倍。这种大的增强可以归因于在具有混合形态的二相PbTe-Sb_2Te_3材料中较低的载流子浓度和增加的界面散射。

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  • 来源
    《Journal of Materials Research》 |2012年第4期|p.734-739|共6页
  • 作者

    Pengxian Lu; Xingbang Wang; Manman Lu;

  • 作者单位

    College of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450007, People's Republic of China;

    Zhengzhou Foreign Language School, Zhengzhou 450000, People's Republic of China;

    Zhengzhou Foreign Language School, Zhengzhou 450000, People's Republic of China;

  • 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
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