Crystallization Process in Fast-quenched Bi-Sr-Ca-Cu-O

Yoshio Oka, Naoichi Yamamoto, Yoichi Tomii, Hitoshi Kitaguchi, Kiichi Oda, Jun Takada

Research output: Contribution to journalArticlepeer-review


As a rule crystallization of amorphous Bi2Sr2CaCu2Oy leads to the 24Å phase followed by the formation of the 30Å phase above 800°C. The nominal composition of the 24Å phase is Bi2Sr2CuOy and hence the crystallization into the 24Å phase causes the problem of the discrepancy of composition. In order to solve the problem, crystallization process of fast-quenched Bi2Sr2CaCu2Oy has been examined by using the X-ray diffraction and SEM-EDX. It has been found that the crystallization of amorphous Bi2Sr2CaCu2Oy into the 24Å phase was accompanied with the phase separation into the 24Å phase and a Cu-rich region so as to adjust the compositions. In the next step of crystallization, the separated regions reacted together above 800°C into the 30Å phase.

Original languageEnglish
Pages (from-to)493-496
Number of pages4
JournalJournal of the Japan Society of Powder and Powder Metallurgy
Issue number5
Publication statusPublished - 1989
Externally publishedYes

ASJC Scopus subject areas

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


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