Co系長尺酸化物ウィスカーの成長と熱電特性  [in Japanese] Growth and Thermoelectric Properties of Long Co-based Oxide Whiskers  [in Japanese]

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Author(s)

Abstract

Three kinds of single crystalline whiskers of Bi<SUB>2</SUB>Sr<SUB>2</SUB>CoO<SUB>6</SUB> (BC-221), (Bi<SUB>2</SUB>Sr<SUB>2</SUB>O<SUB>4</SUB>)<SUB>x</SUB>(CoO<SUB>2</SUB>)<SUB>2</SUB> (BC-222), and (Ca<SUB>2</SUB>CoO<SUB>3</SUB>)<SUB>x</SUB>CoO<SUB>2</SUB> (Co-225) phases were grown from surfaces of precursor plates by annealing in an O<SUB>2</SUB> gas flow. The phases of the whiskers can be controlled by the Co content of the precursor plates Average compositions of the whiskers are Bi<SUB>2.5</SUB>(Sr, Ca)<SUB>3.3</SUB>CoO<SUB>6+δ</SUB>, Bi<SUB>3.0</SUB>(Sr, Ca)<SUB>3.1</SUB>Co<SUB>2.0</SUB>O<SUB>9+δ</SUB>, and (Ca, Sr, Bi)<SUB>1.9</SUB>Co<SUB>2.0</SUB>O<SUB>5+δ</SUB> for the BC-221, the BC-222, and the Co-225 whiskers, respectively. Although the Co-225 whiskers are 1.2mm at the longest, the BC-221 and the BC-222 whiskers reach lengths of as much as 10mm. Because the growth points of the whiskers are their bases, the length of the whiskers depends on the microstructure of the precursor plates. Both BC-222 and Co-225 whiskers show excellent thermoelectric properties at high temperature even in air.

Journal

  • Journal of the Japan Society of Powder and Powder Metallurgy

    Journal of the Japan Society of Powder and Powder Metallurgy 49(5), 393-399, 2002-05-15

    Japan Society of Powder and Powder Metallurgy

References:  17

Codes

  • NII Article ID (NAID)
    10008559560
  • NII NACSIS-CAT ID (NCID)
    AN00222724
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    05328799
  • NDL Article ID
    6169385
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z17-274
  • Data Source
    CJP  NDL  J-STAGE 
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