Bi-2223 bulk superconductor with oriented texture and high transport critical current

Anna Tampieri, G. Celotti

Research output: Contribution to journalConference article

8 Scopus citations

Abstract

BSCCO (2223) superconducting powders were prepared by three different techniques (solid state, pyrolysis and sol-gel) and with three different stoichiometries, essentially based on variations of the Ca/Sr ratio and the Cu concentration. Pressureless sintering was performed on cold uniaxially pressed (1 GPa) samples, avoiding the drawbacks connected with hot pressing; different hot-forging cycles were then applied to attain a greater density and orientation factor. It was found that the process phenomenology is strictly linked to the powder starting stoichiometry: when the composition is very near to the theoretical (2223), the effects of the secondary phase extrusion are observed during hot forging, yielding a purification and inhibition of (2212) formation accompanied by an appreciable increase of Jc with respect to the hot-pressed samples. On the other hand, when the Ca/Sr ratio is considerably greater than one and the Cu excess is low, recrystallization of (2223) from the liquid takes place, with a remarkable improvement of the critical current density (Jc>104 A cm-2).

Original languageEnglish (US)
Pages (from-to)1113-1119
Number of pages7
JournalSuperconductor Science and Technology
Volume13
Issue number8
DOIs
StatePublished - Aug 1 2000
EventThe SMART/SUPERMAT Conference - Giens, France
Duration: Sep 19 1999Sep 23 1999

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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