Characteristics of metal impregnated bulk Gd-Ba-Cu-O superconductors cooled down in a magnetic field

M. Kita, S. Nariki, N. Sakai, I. Hirabayashi

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1 Citation (Scopus)


Gd-Ba-Cu-O bulk superconductors have significant potential for various applications due to their high critical current density and high trapped magnetic field. We investigated the mechanical properties and cryostability of a Gd-Ba-Cu-O bulk superconductor. Increasing the toughness of the bulk and improvement of the heat conduction are both important for enhancing the trapped magnetic field. We introduced a stainless steel ring around the circumference of the bulk to increase the strength of the bulk. Also, we introduced Al wires inserted in the holes along the c-axis of the bulk, after which the sample was impregnated with Bi-Sn-Cd alloy. At T ≤ 77 K, starting from B ≤ 3 T, the 14 mm thick and 44 mm diameter samples were able to trap a flux density of 1.13-1.36 T. The repulsive force between the superconductor sample bulk and a permanent magnet with a surface magnetic induction of 0.37 T was about 70 N for a 1 mm gap. We also measured the temperature rise of the bulk superconductor surface, at various temperatures, when the external field went down from B ≤ 9 to 0 T.

Original languageEnglish
Pages (from-to)S491-S493
JournalSuperconductor Science and Technology
Issue number7
Publication statusPublished - 2006 Jul 1
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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