Processing of GdBa2Cu3O7-y bulk superconductor and its trapped magnetic field

S. Nariki, N. Sakai, M. Murakami

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Large c-axis oriented GdBa2Cu3O7-y (Gd-123) bulk superconductors, which contain Gd2BaCuO5 (Gd-211) secondary phase and Ag, were melt textured under controlled oxygen partial pressure of 1.0%. Nd-123 was used as a seed crystal for the growth of large-grain bulk. Single-domain Gd-123 samples 32 mm in diameter were successfully fabricated with no macro-sized cracks. The employment of fine starting Gd-211 powders led to a reduction in the mean diameter of Gd-211 particles dispersed in the bulk, which resulted in an improvement in both Jc and field-trapping capability. The trapped magnetic field of the bulk Gd-Ba-Cu-O/Ag made from Gd-211 particles 0.8 μm in diameter reached 1.5 T at 77 K. Furthermore, the trapped magnetic field could be improved by the enlargement of bulk diameter and the optimization of Gd-211 content. The maximum trapped field of 2.0 T at 77 K was achieved for the Gd-Ba-Cu-O/Ag bulk sample 48 mm in diameter with the composition of Gd-123:Gd-211 = 10:5.

Original languageEnglish
Pages (from-to)629-634
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume357-360
Issue numberSUPPL. 2
DOIs
Publication statusPublished - 2001 Aug 1

Keywords

  • Critical current density
  • Gd-Ba-Cu-O
  • Melt processing
  • Trapped magnetic field

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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