Improved superconducting properties of melt-textured Nd123 by additional heat treatment

N. Chikumoto, J. Yoshioka, M. Murakami

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We have investigated the effect of additional heat-treatment on the superconducting transition and the flux pinning properties of Nd-Ba-Cu-O melt-textured in air. After the heat-treatment at high temperatures, > 900°C, under low oxygen partial pressure, P(O2) = 0.001 atm, the superconducting transition became sharper accompanied by an increase of Jc. However, the increase of Jc was very small and the secondary peak effect commonly observed in Nd-Ba-Cu-O melt textured in low P(O2) could not be observed. Transmission electron microscopic observations and energy dispersive X-ray analyses show that the spatial variation of the Nd/Ba ratio is reduced after high-temperature heat-treatment, which indicates that an improvement in Tc. and Jc is attributed to a suppression of Nd substitution on the Ba site.

Original languageEnglish
Pages (from-to)79-84
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume291
Issue number1-2
DOIs
Publication statusPublished - 1997 Nov 15

Keywords

  • Critical current density
  • Critical temperature
  • Heat-treatment
  • Melt process
  • Nd-Ba-Cu-O

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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