Subgrains in large-grain RE123 bulk superconductors

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We have investigated the microstructures of large-grain RE123 (RE = Y, Sm) bulk superconductors with an emphasis placed on the effects of subgrains on superconducting properties. For the samples grown by slow-cooling, the misorientation angles of the subgrains were larger at the later stage of the growth. For isothermally grown samples, subgrains are likely to form under large undercooling. Based on the results of micro-area x-ray pole figure analyses, the possible mechanism of subgrain formation was concluded to be the accumulation of dislocations formed as a result of entrapment of RE211 inclusions during crystal growth. Both magnetization and transport measurements showed that the subgrains act as weak-links. Hence the amount of subgrains should be minimized for the fabrication of high performance large-grain RE 123 materials.

Original languageEnglish
Pages (from-to)791-795
Number of pages5
JournalSuperconductor Science and Technology
Volume15
Issue number5
DOIs
Publication statusPublished - 2002 May
Externally publishedYes

Fingerprint

Superconducting materials
Undercooling
entrapment
supercooling
Crystallization
Crystal growth
misalignment
crystal growth
Poles
Magnetization
poles
inclusions
Cooling
cooling
Fabrication
X rays
magnetization
microstructure
Microstructure
fabrication

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Subgrains in large-grain RE123 bulk superconductors. / Ogasawara, Kei; Sakai, Naomichi; Murakami, Masato.

In: Superconductor Science and Technology, Vol. 15, No. 5, 05.2002, p. 791-795.

Research output: Contribution to journalArticle

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