Chemical and Mechanical Stability of the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-o System (IV)—Formation of the High-Tc Phase in Amorphous Powder Prepared by Mechanical Grinding—

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

Research output: Contribution to journalArticlepeer-review

Abstract

Chemical and mechanical stability of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system has been studied. In particular, the formation of the high-Tc phase has been discussed for samples of the amorphous powder with a composition of Bi0.9Ph0.2Sr1.0Ca1.0Cu1.6Oz prepared by mechanical grinding. Annealing of the amorphous powder at low temperatures(500-800°C) leads to precipitation of some impurity phases. The Pb-rich low-Tc phase with an orthorhombic structure symmetry was found to form in samples of the amorphous powder heated at 820°C in air. The formation of the Pb-rich low-Tc phase seems to suppress the formation of the high-Tc phase in subsequent heat treatments at 850°C. Almost monophasic products of the high-Tc phase were obtained when the amorphous powder was heated at 840°C for 48h and subsequently at 850°C for 96h after calcination at 720°C.

Original languageEnglish
Pages (from-to)187-190
Number of pages4
JournalJournal of the Japan Society of Powder and Powder Metallurgy
Volume40
Issue number2
DOIs
Publication statusPublished - 1993

ASJC Scopus subject areas

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

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