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Effects of second phases on thermoelectric properties in copper sulfides with Sn addition

机译：第二相对添加锡的硫化铜热电性能的影响

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摘要

The Cu-S compounds have been reported as promising thermoelectric materials with abundant element composition, low price, and low toxicity. In this work, Sn xCu1.8-xS samples with different Sn contents (x = 0.005, 0.01, 0.03, and 0.05) were fabricated by mechanical alloying combined with spark plasma sintering. The phase structure and microstructure of all the bulk samples were checked by X-ray diffraction (XRD) and field emission scanning electron microscopy respectively. The thermoelectric transport properties, such as electrical conductivity, Seebeck coefficient, carrier concentration, carrier mobility, and thermal conductivity, were measured. The effect of second phase introduced by Sn addition on the thermoelectric properties of Cu-S system was investigated. The thermoelectric properties of samples were improved by the precipitations of two different second phases (Cu2SnS3 and Cu4SnS4). The second phase species depend on the Sn contents. Finally, the Sn0.01Cu1.79S bulk sample obtained the highest ZT value of 0.81 at 773 K, which is 1.6-fold higher than that of the pristine Cu1.8S sample due to the significantly reduced thermal conductivity by second phase and nanopores scattering.
机译：据报道，Cu-S化合物是前景广阔的热电材料，具有丰富的元素组成，低廉的价格和低毒性。在这项工作中，通过机械合金化结合火花等离子体烧结制备了具有不同Sn含量（x = 0.005、0.01、0.03和0.05）的Sn xCu1.8-xS样品。分别通过X射线衍射（XRD）和场发射扫描电子显微镜检查了所有块状样品的相结构和显微结构。测量了热电传输特性，例如电导率，塞贝克系数，载流子浓度，载流子迁移率和热导率。研究了添加锡引起的第二相对Cu-S体系热电性能的影响。两种不同的第二相（Cu2SnS3和Cu4SnS4）的沉淀改善了样品的热电性能。第二相种类取决于Sn含量。最后，Sn0.01Cu1.79S块状样品在773 K处获得最高ZT值0.81，比原始Cu1.8S样品高1.6倍，这是由于第二相和纳米孔散射显着降低了热导率。

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  • 来源
    《Journal of Materials Research》 |2017年第16期|3029-3037|共9页
  • 作者

    Qin Peng; Ge Zhenhua; Feng Jing;

  • 作者单位

    Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, China;

    Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, China;

    Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 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
  • 中图分类
  • 关键词

    copper sulfides; second phases; thermoelectric properties;

    机译：硫化铜第二阶段;热电性质;

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