Crystal Chemistry of Oxide Superconductors - Synthesis and Properties of (Y,La,Ba)3Cu3Oy Pseudo-ternary System

Ayako Tokiwa, Masae Kikuch], Yasuhiko Syono, Osamu Nakatsu, Norio Kobayashi, Yoshio Muto

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Superconductig compounds of pseudo-ternary (Y, La, Ba)3Cu3Oysystem were synthesized and crystallographic parameters and superconducting properties were measured. Compounds of YBa2_xLaxCu3Oyseries were found to be single phase up to x=l and orthorhombic to tetragonal transition at room temperature took place with x=0.5. Tc decreased with increasing x and superconductivity disappeared for x>0.6. These results can be interpreted to be due to the decrease In average valence of copper ions from 2.33 of YBa2Cu3O7with increasing x, which was caused by the substitution of divalent Ba Ions by trivalent La ions. On the other hand complete solid solution was formed for Yj_xLaxBa2Cu3Oyseries, where Tc decreased gradually with increasing x. Considerable increase In Tc was found for the La substituted specimens by annealing around 400°C for 24hrs.

本文言語English
ページ(範囲)559-562
ページ数4
ジャーナルJournal of the Japan Society of Powder and Powder Metallurgy
34
10
DOI
出版ステータスPublished - 1987
外部発表はい

ASJC Scopus subject areas

  • 機械工学
  • 産業および生産工学
  • 金属および合金
  • 材料化学

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