Crystal phases of bisrcacu2ox heat treated in a vacuum-sealed system

Yoshio Oka, Naoichi Yamamoto, Akiko Yuba, Hitoshi Kitaguchi, Jun Takada

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9 Citations (Scopus)


Heat treatment in a vacuum-sealed system on BiSrCaCu2Ox was studied in comparison with that in air. The melting temperature was lowered from 880°C in air to 850°C in the vacuum-sealed system. The formation of the phase with 37 Å c spacing was enhanced in the vacuum-sealed system by heating above the melting temperature and the infsequent annealing in air improved the sharpness of the superconducting transition at 110 K. The heat treatment in the reduced pressure also caused the reduction of the Cu ion and it was suggested that the oxidation state of the Cu ion played an important role in the formation of the phase with 37 Å c spacing.

Original languageEnglish
Pages (from-to)L1429-L1431
JournalJapanese Journal of Applied Physics
Issue number8 A
Publication statusPublished - Aug 1988


  • BiSrCaCu20
  • High-7c superconductivity
  • Layered structure
  • Oxidation state
  • Vacuum-sealed system

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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