Decomposition behavior of high-Tc superconductor YBa2Cu3Ox in water

Hitoshi Kitaguchi, Jun Takada, Akiyoshi Osaka, Yosinari Miura, Naoichi Yamamoto, Yoshio Oka, Masao Kiyama, Teruyoshi Unesaki, Yoichi Tomii

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

High-Tc superconductor - 6.8) reacts upon water to decompose. In order to clarify the process of decomposition, the microstructure of the YBC ceramics was studied by means of X-ray diffraction and EPMA after the reaction with water under autoclave and ambient conditions. Under the treatment in the autoclave above 100°C, the YBC ceramics were fully decomposed and Y(OH)3 or YOOH, Ba2+ and CuO were found in the solution. Due to the EPMA study on the samples treated under ambient conditions, three regions were confirmed in the grains: a) the inner core region without any interaction with water, b) the intermediate region of low Ba content surrounding the core, and c) the surface layer containing Y and Cu in the molar ratio Y/Cu=l/3 and very little amount of Ba. On these basis, it is concluded that the decomposition of the YBC ceramics is due to the diffuse-out of Ba cations to water and that the decomposition is not accompanied by the formation of Y2BaCuO5 phase.

Original languageEnglish
Pages (from-to)651-658
Number of pages8
JournalJournal of the Japan Society of Powder and Powder Metallurgy
Volume34
Issue number10
DOIs
Publication statusPublished - 1987

ASJC Scopus subject areas

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

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