Preparation of 94 K-superconducting NdBa2Cu3O7-δ without post-anneal in oxygen

S. Fujihara, N. Yoshida, T. Kimura

研究成果: Article査読

14 被引用数 (Scopus)


The preparation of the polycrystalline NdBa2Cu3O7-δ superconductor using Ba2Cu3O5+x as a precursor has been studied. Ba2Cu3O5+x was prepared by the sol-gel process using metal acetates as starting materials, tartaric acid as an chelating reagent and water as solvent. The gel was heated at 780°C for 60 h in O2 to form the Ba2Cu3O5+x. precursor. The value of x in Ba2Cu3O5+x was determined to be 0.5; that is, copper was in a highly oxidized state over +2. NdBa2Cu3O7-δ was obtained by the solid-state reaction between Nd2O3 and Ba2Cu3O5+x heated at 900°C for 20 h in N2. Although the sample did not undergo post-anneal in oxygen, it showed good superconducting properties; Tc of 94 K and the intragranular Jc of 3.7 × 105 A/cm2 under a field of 50 kOe at 20 K. The advantage of using Ba2Cu3O5+x is considered to be its sufficient amount of oxygen as well as prevention of the Nd3+/Ba2+ substitution.

ジャーナルPhysica C: Superconductivity and its applications
出版ステータスPublished - 1997 3月 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学


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