Thermoelectric Properties and Microstructure of(Zn_<0.98>Al_<0.02>)O Prepared by MA/HP Process

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The (Zn<SUB>0.98</SUB>Al<SUB>0.02</SUB>)O ceramic is known to show high dimensionless figure of merit(ZT)at high temperature among the n-type oxide materials. But it has problem of the large lattice thermal conductivity compared with other thermoelectric materials. However the lattice thermal conductivity can be decreased by grain refining, and further improvement in the ZT value is possible. Thus we have tried to synthesize homogeneous (Zn<SUB>0.98</SUB>Al<SUB>0.02</SUB>)O powders with fine particles size by mechanical alloying(MA), and make the fine grained and dense (Zn<SUB>0.98</SUB>Al<SUB>0.02</SUB>)O ceramic under several sintering conditions, expeceting the increase of ZT value due to the decrease in lattice thermal conductivity. We found an optimum MA condition for grain refinement, but homogeneous (Zn<SUB>0.98</SUB>Al<SUB>0.02</SUB>)O powders could not be obtained under present MA conditions. The fine grained and dense (Zn<SUB>0.98</SUB>Al<SUB>0.02</SUB>)O ceramic obtained by MA/HP process shows the decrease in lattice thermal conductivity. Hot pressing was found to decrease the absolute value of Seebeck coefficient and increase the electrical conductivity as compared with the normal sintering (NS). MA/HP process will increase the amount of the substituted Al for Zn. The ZT value became the maximum by the MA/NS; ZT=0.13 at 1073K.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 50(11), 937-943, 2003-11-15

    Japan Society of Powder and Powder Metallurgy

参考文献:  13件中 1-13件 を表示

被引用文献:  1件中 1-1件 を表示

  • 粉末の成形加工

    粉体加工成形プロセス分科会

    塑性と加工 = JOURNAL OF THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY 45(523), 652-656, 2004-08-25

    参考文献132件

各種コード

  • NII論文ID(NAID)
    10012549487
  • 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
    6787151
  • 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 
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