Subgrain structures in RE123 bulk superconductors

Kei Ogasawara, Naomichi Sakai, Masato Murakami

Research output: Contribution to journalArticlepeer-review


We have studied the microstructures of subgrains in large-grain RE123 (RE = Y, Sm) bulk superconductors through microscopic observation and x-ray pole figure analyses. For the samples grown by slow-cooling, misorientation of the subgrains increases along with the crystal growth, and also that the misorientation has positive relation to the size and concentration of the second-phase particles. For isothermally grown samples, subgrains are likely to form under large undercooling. We discuss the possible mechanism of subgrain formation. Such subgrains are considered to affect current carrying capabilities in bulk materials, so that we performed magnetic and electric measurements for several samples having different subgrain structures. The results of Jc-B and AC transport measurements indicated that the subgrains act as weak-links, especially under high magnetic fields.

Original languageEnglish
Pages (from-to)302-308
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number4
Publication statusPublished - 2002 Apr
Externally publishedYes


  • Bulk superconductor
  • Micro-area x-ray diffraction
  • Polarized optical microscopy
  • Pole figure
  • RE123
  • Subgrain
  • Superconducting properties
  • Transmission electron microscopy
  • Weak-link

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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