La_<3-x>A_xS_4(A=Ba, Ca)の熱電特性 Thermoelectric Properties of La_<3-x>A_xS_4(A=Ba, Ca)

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著者

    • 勝山 茂 KTSUYAMA Shigeru
    • 大阪大学工学部材料物性工学科 Department of Materials Science and Engineering, Faculty of Engineering, Osaka University
    • 田中 芳幸 TANAKA Yosiyuki
    • 大阪大学工学部材料物性工学科 Department of Materials Science and Engineering, Faculty of Engineering, Osaka University
    • 永井 宏 NAGAI Hiroshi
    • 大阪大学工学部材料物性工学科 Department of Materials Science and Engineering, Faculty of Engineering, Osaka University

抄録

The effectiveness of substitution for La by Ba or Ca on the physical properties of rare earth chalcogenide La<SUB>3</SUB>S<SUB>4</SUB> was examined. Cubic γ -phase (Th<SUB>3</SUB>P<SUB>4</SUB>-type) was obtained in the range of 0≤x≤1 in La<SUB>3-x</SUB>A<SUB>x</SUB>S<SUB>4</SUB> (A=Ba, Ca). The lattice parameter in La<SUB>3-x</SUB>Ba<SUB>x</SUB>S<SUB>4</SUB> system increased, while that in La<SUB>3-x</SUB>Ca<SUB>x</SUB>S<SUB>4</SUB> system decreased with an increase of x, which is ascribed to the difference of the radius among the ions. The thermoelectric power (α) and the electrical resistivity (ρ) of La<SUB>3-x</SUB>A<SUB>x</SUB>S<SUB>4</SUB>, which are functions of the electron concentration, increased with an increase of the temperature and the alkaline earth metal content x. A maximum value of the power factor (p=α<SUP>2</SUP>/ρ) at high temperature above 750K was obtained at x=0, i.e., La<SUB>3</SUB>S<SUB>4</SUB>. On the other hand, the thermal conductivity (κ) decreased with an increases of x. In result, a maximum value of the figure of merit (Z=α<SUP>2</SUP>/(ρκ)) was obtained at large value of x (x≈0.6 in La<SUB>3-x</SUB>, Ba<SUB>x</SUB>S<SUB>4</SUB> and x≈0.8 in La<SUB>3-x</SUB>Ca<SUB>x</SUB>S<SUB>4</SUB>).

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 43(6), 807-812, 1996-06-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002012522
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    3976305
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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