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Bi(Pb)–Sr–Ca–Cu–O (2223) superconductor prepared by improved sol–gel technique

Authors
Publisher
Elsevier Ltd
Publication Date
Volume
20
Issue
2
Identifiers
DOI: 10.1016/s0955-2219(99)00158-2
Keywords
  • Oxide Superconductors
  • Powder-Chemical Preparation
  • Sol–Gel Processes

Abstract

Abstract A particular sol–gel process for preparation of BSCCO (2223) powder was devised, settled and tested. Water-in-oil type emulsion technique associated to internal gelation process was chosen, starting from cations' nitrates. Dried powders were calcined for a few minutes at 400°C and then fired at 850°C in steps of 5 h with intermediate grindings: in only 14 h 92% pure (2223) phase was obtained. Powder mean particle size resulted very low (<1 μm) and morphology is characterized by globular grains which are both promising features for subsequent pressure sintering technique. Moreover, the method appears well adaptable to large scale production.

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