Microstructure and critical current densities of Bi-2223 superconductor solidified in high magnetic fields

Xiaoye Lu, Akihiko Nagata, Kazuo Watanabe, Tsutomu Nojima, Kazuhisa Sugawara, Shin Ichi Kamada, Shuji Hanada

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The microstructure and critical current densities of Bi-2223 superconductor with Ag2O and MgO additions after partial-melting and solidification in high magnetic fields were investigated. It has been found that the Bi-2212 grains with their c-axis parallel to the magnetic field are formed after partial-melting and solidification in 8 T magnetic field, and transform into the Bi-2223 grains with c-axis alignment during the further sintering process at 1113 K in zero magnetic field. The optimum partial-melting temperatures Tmax of non-added, 5 mass%Ag2O and 5 mass%MgO added samples are 1147 K, 1143 K and 1153 K, respectively. 5 mass%Ag2O and 5 mass%MgO additions enhance the c-axis alignment of (Bi, Pb)-2223 phase. The largest Jc value appears in the 5 mass%MgO added sample with Tmax=1153 K. MgO particles homogeneously disperse in the oriented (Bi, Pb)-2223 platelets. The MgO added sample has small non-superconducting second phase particles, whereas the Ag2O added sample has large second phase particles.

Original languageEnglish
Pages (from-to)254-259
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume66
Issue number4
DOIs
Publication statusPublished - 2002 Apr

Keywords

  • Bismuth oxide superconductor
  • Critical current density
  • Magnetic field
  • Microstructure
  • Solidification
  • Texture

ASJC Scopus subject areas

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

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