MGおよびMA法による熱電変換材料の高性能化 High-performance Thermoelectric Materials Prepared by MG or MA Technique

この論文にアクセスする

この論文をさがす

著者

    • 勝山 茂 KATSUYAMA Shigeru
    • 大阪大学大学院工学研究科マテリアル応用工学専攻 Department of Materials Science and Processing, Graduate School of Engineering, Osaka University

抄録

We have examined the thermoelectric properties of Co<SUB>1-x</SUB>Fe<SUB>x</SUB>Sb<SUB>3</SUB> ternary system and CoSb<SUB>3</SUB>-FeSb<SUB>2</SUB> composite system. The Seebeck coefficient and the electrical resistivity are generallyreduced by the substitution for Co by Fe. The thermal conductivity is also reduced by the substitution especially at high iron content region. These behaviors of the thermoelectric properties in the samples with low iron content are ascribed to the substituted Fe, while those in the samples with high iron content are ascribed to the precipitated FeSb<SUB>2</SUB> (Fe<SUB>0.73</SUB>Co<SUB>0.27</SUB>Sb<SUB>2</SUB>) compound. Co<SUB>0.75</SUB> Fe<SUB>0.25</SUB>Sb<SUB>3</SUB> has a maximum value of figure of merit of 4.8×10<SUP>-4</SUP> K<SUP>-1</SUP> at 773K. For the purpose of more reducing of the thermal conductivity, we have prepared the CoSb<SUB>3</SUB>-FeSb<SUB>2</SUB> composite where the FeSb<SUB>2</SUB> particles are dispersed in the CoSb<SUB>3</SUB> matrix by MG (mechanical grinding) technique. The thermal conductivity of the composite is smaller than that of Co<SUB>1-x</SUB>Fe<SUB>x</SUB>Sb<SUB>3</SUB>. The electrical resistivity of the composite increases with increasing MG time, but it is smaller than that of CoSb<SUB>3</SUB> at high temperature. The decrease of the thermal conductivity and the less increase of the electrical resistivity are ascribed to the enhancement of the phonon scattering caused by the dispersed FeSb<SUB>2</SUB> in the matrix and the low electrical resistivity of FeSb<SUB>2</SUB>, respectively. As a result, the composite whose molar ratio of CoSb<SUB>3</SUB> to FeSb<SUB>2</SUB> is 0.7 to 0.3 and MG time is 25h has a maximum value of figure of merit of 6.1×10<SUP>-4</SUP> K<SUP>-1</SUP> at 756K. This value is larger than the maximum value of 4.8×10<SUP>-4</SUP> K<SUP>-1</SUP> for Co<SUB>1-x</SUB>Fe<SUB>x</SUB>Sb<SUB>3</SUB> system.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 46(3), 219-226, 1999-03-15 

    Japan Society of Powder and Powder Metallurgy

参考文献:  17件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

被引用文献:  1件

被引用文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

  • NII論文ID(NAID)
    10002261964
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    05328799
  • NDL 記事登録ID
    4690151
  • 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  CJP引用  NDL  J-STAGE 
ページトップへ