Chemical and Mechanical Stability of the Ba-added High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System

Jun Takada, Kosei Fujisaka, Katsunori Hosotani, Toshio Egi, Yoshihiro Kusano, Tokuro Nanba, Yasunori Ikeda, Mikio Takano

Research output: Contribution to journalArticle

Abstract

Chemical and mechanical stability of the Ba-added high-Tc phase has been studied using XRD and DTA for samples of Bi0.9Pb0.2Sr1.0BaxCa1.0Cu1.6Oz with x=0 and 0.05. Some impurities were observed in all samples after the heat treatment at 300∼820°C. BaPb0.75Bi0.25O3 was also formed in the Ba-added samples heated at 700∼800°C. These impurities were thought to be formed from the amorphous phase which was produced by mechanical grinding of the high-Tc phase. The impurities disappeared and an almost monophasic sample of the high-Tc phase was obtained by heating at 850°C. The lattice parameter c of the Ba-added high-Tc phase was longer than that of the Ba-free one above 800°C. The parameter c of the Ba-added sample heated at 850°C increased with an increase of heating time and was saturated over 48h. The increase of c was due to the Ba dissolution in the high-Tc phase.

Original languageEnglish
Pages (from-to)204-207
Number of pages4
JournalJournal of the Japan Society of Powder and Powder Metallurgy
Volume40
Issue number2
DOIs
Publication statusPublished - Jan 1 1993

ASJC Scopus subject areas

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

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