Influence of P on Microstructure and Thermoelectric Property of Sintered (Bi_<0.2>Sb_<0.8>)_2Te_3 Alloy

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A combination of mechanical alloying and pulse discharge sintering (MA-PDS) was employed to synthesize the bulk (Bi<SUB>0.2</SUB>Sb<SUB>0.8</SUB>)<SUB>2</SUB>Te<SUB>3</SUB> alloys with the P addition up to 2.0 mass%. The effect of P on the microstructure and thermoelectric performance of the compacts were investigated. The added P exists in the alloyed powders and compacts in the form of second phase particles. The dispersed P particles were found to decrease the size of (Bi, Sb)<SUB>2</SUB>Te<SUB>3</SUB> crystallites and inhibit the densification of the alloyed powders. When the P content ≥1.0 mass%, (Bi<SUB>0.2</SUB>Sb<SUB>0.8</SUB>)<SUB>2</SUB>Te<SUB>3</SUB>/P nanocomposites were developed by the MA-PDS process. Inclusion of a small fraction of P (≤0.1 mass%) is harmless to the thermoelectric performance of the p-type (Bi<SUB>0.2</SUB>Sb<SUB>0.8</SUB>)<SUB>2</SUB>Te<SUB>3</SUB> alloy. In the samples with high P contents, in particular, ≥1.0 mass%, however, the increase in the electrical resistivity is much greater than the decrease in the thermal conductivity, finally giving rise to degradation of the room-temperature figure of merit.

収録刊行物

  • Materials transactions

    Materials transactions 43(9), 2297-2302, 2002-09-01

    公益社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10012326336
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    6313337
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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