New Technology to improve texturing and transport current in bulk (2223) BSCCO superconductors

A. Tampieri, G. Celotti, G. Calestani, S. Lesca

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Bulk BSCCO (2223) was prepared by a multi-step process (high cold pressing + pressureless sintering + hot-forging (HF)) to increase the extent of grain orientation. It has been found that the final density of the samples exceeds 95% and the orientation factor increases up to ≈80%. Powders were prepared with different techniques starting by several nominal compositions. The introduction of a short high-temperature treatment during HF, acts as a purifying process, promoting in addition the extrusion of secondary phases and leaving in the sample only the (2223) as a superconducting phase and islands of Ca-Sr-Cu-O and CuO. In the case of the powder nearest to the stoichiometric composition, an annealing at 400°C in oxygen was found essential to recover the oxygen content, lost during densification and texturing treatments, and to increase Tc0. Samples prepared with powder having calcium and copper excess do not contain (2212) phase even after hot-forging. As a consequence, Jct value of the textured samples, at 77K, reaches ≈10000A/cm2, i.e. two order of magnitude higher in respect to the simple PLS sample. The use of sol-gel powder improves the texturing of the final samples, while Jc values result less improved than expected, due to the huge growth of secondary phases precipitates.

Original languageEnglish (US)
Pages (from-to)1247-1250
Number of pages4
JournalKey Engineering Materials
Issue number136 PART 2
StatePublished - 1997

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'New Technology to improve texturing and transport current in bulk (2223) BSCCO superconductors'. Together they form a unique fingerprint.

Cite this