Synthesis of c-axis Oriented Na_xCo_2O_4 Thermoelectric Oxide by the Citric Acid Complex Method

この論文にアクセスする

この論文をさがす

著者

抄録

The citric acid complex (CAC) process and subsequent pressureless sintering were explored towards the synthesis of a c-axis oriented Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB> thermoelectric polycrystal. The effects of the CAC process on the shape of powder precursor, crystallographic anisotropy of a sintered compact and its thermoelectric properties were investigated. The CAC process provided a plate-like powder precursor composed of the γ-Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB> phase, reflecting its layered crystal structure. During compacting and sintering of this powder, the plate-like grains were well aligned along the pressed plane because of their specific shape, resulting in the sintered body with large crystallographic anisotropy. The CAC method was also effective for synthesizing the sample with compositional homogeneity and fine microstructure. The electrical resistivity of the CAC sample was almost the same as that of the sample prepared by the conventional solid state reaction method in spite of the fine microstructure, because of its high degree of c-axis orientation. The Seebeck coefficient was significantly improved by adopting the CAC method, resulting in the large enhancement of the power factor.

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), 952-957, 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:  5件中 1-5件 を表示

各種コード

  • NII論文ID(NAID)
    10012549520
  • 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
    6787213
  • 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