Mechanism of formation of YBa2Cu4O8 superconductor in the sol-gel synthesis

Shinobu Fujihara, Hiromitsu Kozuka, Toshinobu Yoko, Sumio Sakka

研究成果: Article査読

4 被引用数 (Scopus)

抄録

It was shown that a single phase YBa2Cu4O8 (124-phase) could be formed from gels at 1 atm oxygen pressure, and the mechanism of its formation was elucidated. It was found that there are two key routes for the sol-gel formation of the 124-phase, one involving the tetragonal YBa2Cu3Oy with a low concentration of oxygen defects (tetra-I phase) and the other involving the Ba2Cu3O5.9 as important intermediates of the 124-phase. The rapid formation of these intermediate compounds from the gel was attributed to the small particle size of the oxides and carbonates precipitating at the initial stage of heating. It was thought that the small particles characteristic of sol-gel processing lead to the rapid formation of the intermediate compounds and subsequent precipitation of the 124-phase.

本文言語English
ページ(範囲)133-140
ページ数8
ジャーナルJournal of Sol-Gel Science and Technology
1
2
DOI
出版ステータスPublished - 1994 1月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 化学一般
  • 生体材料
  • 凝縮系物理学
  • 材料化学

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