Formation of the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System in Various Atmospheres

Naoya Kobayashi, Minoru Fukuhara, Akira Doi, Toshio Takada, Yoshihiro Kusano, Jun Takada, Yasunori Ikeda, Mikio Takano

Research output: Contribution to journalArticlepeer-review


Samples with compositions of Bi:Pb:(Sr, Ba):Ca:Cu=0.9:0.2:(1.0-x, x):1.0:1.6, in which O≦x≦0.07, were prepared by heating at 844°C in air after heating at 828°C in air or at 787°C in Ar. The Pb-free(or poor)low-Tc phase with a tetragonal structure was formed by heating at 828°C in air, while the heat treatment at 787°C in Ar led to formation of the Pb-rich low-Tc phase with anorthorhombic structure. The lattice parameter c of these low-Tc phases increases as x increases, resulting from the Ba substitution for Sr. By the final heating in air, the high-Tc phase forms through the Pb-rich low-Tc phase as well as the Pb-poor one. Ba substitution promotes the formation of the high-Tc phase and elongates its c-axis le.

Original languageEnglish
Pages (from-to)200-203
Number of pages4
JournalJournal of the Japan Society of Powder and Powder Metallurgy
Issue number2
Publication statusPublished - 1993

ASJC Scopus subject areas

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


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