Effects of Mechanical Milling with Ag Powder on Thermoelectric Properties of Na_xCo_2O_4 Polycrystal Synthesized through Citric Acid Complex Process

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抄録

Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB> powders synthesized by citric acid complex (CAC) process were mechanically milled with Ag particles around 1μm in size and then pressurelessly sintered. Effects of the mechanical milling on microstructure and thermoelectric properties of a Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB>/Ag composite were investigated. Ag powder was finely dispersed in the Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB>/Ag mixed powder after mechanical milling. The Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB>/Ag sintered bodies showed the large crystallographic anisotropy as compared to the Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB>/Ag composite synthesized by the conventional CAC process. However, Ag particles were coarsened during sintering, and the Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB>/Ag composite polycrystal with dispersion of fine Ag grains could not be obtained. By Ag addition, the electrical resistivity was significantly reduced, but the thermal conductivity was increased because of the coarse Ag phase, resulting in the dimensionless figure of merit almost the same as, or smaller than, that of the sample without Ag.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 55(2), 90-95, 2008-02-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10021172632
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    9390020
  • 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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