Ｌａ３－ｘＡｘＳ４（Ａ＝Ｂａ，Ｃａ）の熱電特性

• 勝山 茂

  大阪大学工学部材料物性工学科

• 田中 芳幸

  大阪大学工学部材料物性工学科

• 真島 一彦

  大阪大学工学部材料物性工学科

• 永井 宏

書誌事項

タイトル別名

• Thermoelectric Properties of La3-xAxS4 (A=Ba,Ca).
• La3-xAxS4 A Ba Ca ノ ネツデン トクセイ

抄録

The effectiveness of substitution for La by Ba or Ca on the physical properties of rare earth chalcogenide La₃S₄ was examined. Cubic γ -phase (Th₃P₄-type) was obtained in the range of 0≤x≤1 in La_3-xA_xS₄ (A=Ba, Ca). The lattice parameter in La_3-xBa_xS₄ system increased, while that in La_3-xCa_xS₄ 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_3-xA_xS₄, 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=α²/ρ) at high temperature above 750K was obtained at x=0, i.e., La₃S₄. 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=α²/(ρκ)) was obtained at large value of x (x≈0.6 in La_3-x, Ba_xS₄ and x≈0.8 in La_3-xCa_xS₄).

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

  一般社団法人 粉体粉末冶金協会

キーワード

• La<SUB>3-x</SUB>A<SUB>x</SUB>S<SUB>4</SUB>(A=Ba, Ca)system
• thermoelectric power
• electrical resistivity
• thermal conductivity
• figure of merit

詳細情報

• CRID: 1390001206308546944
• NII論文ID: 10002012522
• NII書誌ID: AN00222724
• DOI: 10.2497/jjspm.43.807
• ISSN: 18809014
• ISSN: 05328799
• NDL書誌ID: 3976305
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3976305
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可