Thermoelectric Properties of Sintered FeSi2 with Fe-site Substitution and Microstructural Modification

DOI IR (HANDLE) Open Access
  • Ohtaki Michitaka
    Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Ogura Daisuke
    Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Eguchi Koichi
    Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Arai Hiromichi
    Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University

Bibliographic Information

Other Title
  • 部分元素置換と微細構造制御を行った FeSi2 焼結体の熱電特性

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Description

Partial substitution of Cr, Mn, Co, or Ni for Fe in FeSi2 led to stably semiconducting FeSi2, of which p-type appeared with Cr and Mn whereas Co- and Ni-substitution caused n-type. Substitution of other various transition and non-transition metals for Fe significantly varies the microstructure of sintered samples. Consequently, the thermoelectric power increases and the electrical conductivity decreases with decreasing relative density of the samples. On the other hand, H2 reduction of a thin oxide layer on the surface of the sintered samples notably improved the thermoelectric power without changing the electrical conductivity. Microstructural modification by varying the particle size of the powders for the sintering procedure revealed that the sample consists of the most coarse particles attained the maximum value of the thermoelectric figure of merit since the coarse particles decreased the surface area and the thermal conductivity of the sintered body.

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Details 詳細情報について

  • CRID
    1390853649766973184
  • NII Article ID
    120002168846
  • NII Book ID
    AN00055101
  • DOI
    10.15017/17294
  • HANDLE
    2324/17294
  • Text Lang
    ja
  • Article Type
    departmental bulletin paper
  • Data Source
    • JaLC
    • IRDB
    • CiNii Articles
  • Abstract License Flag
    Allowed

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