Effect of Heating Atomosphere on Segregation and Dissolution of the Pb-compound in the Bi-2223 Phase

Yoshihiro Kusano, Tokuro Nanba, Jun Takada, Yasunori Ikeda, Mikio Takano

Research output: Contribution to journalArticle

Abstract

Thermal behavior of the Bi-2223 phase in the Bi, Pb-Sr-Ca-Cu-0 system, especially segregation and dissolution reaction of the “3321” phase which was identified as Sr2.5Bi0.5Pb3Ca2CuO2, has been studied by XRD, SQUID and resistivity measurements. On annealing below 830°C in air, the “3321” phase precipitated from the 2223 crystals. When the 2223 phase was annealed at 750°C in O2stream, the precipitation of the “3321” phase increased. On annealing at 750°C in Ar stream, however, no precipitation of the “3321” phase was detected. By reheateing at 850°C even for lmin, the “3321” phase was almost dissolved into the mother 2223 crystals. When the 2223 phase was reheated at 750°C in Ar stream after annealing at 750°C in air, the “3321” phase disappeared. On the contrary, the “3321” phase was stable on reheating at 870°C in O2stream. Therefore, it seems that the “3321” and the 2223 phase coexist in epuilibrium in a high oxygen partial pressure.

Original languageEnglish
Pages (from-to)388-391
Number of pages4
JournalJournal of the Japan Society of Powder and Powder Metallurgy
Volume41
Issue number4
DOIs
Publication statusPublished - Jan 1 1994

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ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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