Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Characterizations of fine Bi-2223 precursor powder by spray pyrolysis process

분무 열분해법으로 제조된 미세 Bi-2223 전구분말의 특성

  • Kim S. H. (Korea Institute of Machinery & Materials, Changwon) ;
  • Yoo J. M. (Korea Institute of Machinery & Materials, Changwon) ;
  • Ko J. W. (Korea Institute of Machinery & Materials, Changwon) ;
  • Kim Y. K. (Korea Institute of Machinery & Materials, Changwon)
  • Published : 2005.04.01
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Abstract

Homogeneous and fine powders for Bi-2223 tape were prepared by ultrasonic spray pyrolysis (SP) method from an aqueous solution of metal nitrates. Bi-2223 precursor powders were synthesized with various solutes concentration and pyrolysis temperature. The synthesized precursor powders had a narrow particle size distribution and an average particle size was $\~{\cal}um$. The reactivity of precursor powder by SP method is very high, attributed to the fine and narrow particle size distribution. Bi-2223/Ag tape was prepared using PIT method and followed by various sintering conditions. The precursor powder by SP method promoted a very quick formation of the Bi-2223 phase for short sintering time while the secondary phase such as large AEC phase and $Ca_2PbO_4$ were minimized for SP tapes.

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