Structure and formation mechanism of subgrains in large single-grain RE-Ba-Cu-O (RE = Y, Sm, Nd) bulk superconductors

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Abstract

We have studied the subgrain structures in large single-grain RE-Ba-Cu-O (RE = Y, Nd, Sm) bulk superconductors with polarized optical microscopic observations and micro-area X-ray pole figure measurements. Subgrains were formed in the early stage of grain growth, and were elongated along the growth direction with increasing their misalignment. Based on the comparative study of misorientation angles with the geometry of the second-phase particles, as well as microstructural defect studies using transmission electron microscope, the subgrains are created by the particle incorporation and their related lattice defects through the instability at the solidification front.

Original languageEnglish
Pages (from-to)685-689
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume357-360
Issue numberSUPPL. 2
DOIs
Publication statusPublished - 2001 Aug
Externally publishedYes

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Keywords

  • Microscopy
  • Misorientation
  • Pole figure
  • REBCO
  • Subgrain

ASJC Scopus subject areas

  • Condensed Matter Physics

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