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Journal of Superconductivity

, Volume 2, Issue 4, pp 501–511 | Cite as

Structure and superconductivity of Bi-(Pb)-Ca-Sr-Cu-O ceramics processed by arc melting

  • Gh. Aldica
  • M. Popescu
  • E. Cruceanu
  • L. Miu
  • J. Jaklovszky
  • S. Mandache
Article
  • 26 Downloads

Abstract

The Bi-(Pb)-Ca-Sr-Cu-O ceramics of typical cation composition 2 (0.4) 223, presintered at 800°C, are formed by arc melting and rapidly cooling the 2021 superconducting phase, CaO, and Cu2O. The arc-melted samples sintered in air at 840°C exhibit a solid-state structural transformation of the components and a mixture of 2122 and 2223 superconducting phases, and small amounts of Ca2CuO3, Ca2PbO4, and CuO appear. When the arc melting is used as an intermediate stage in the preparation of the high-T c superconductors in this system, a significant increase in density (from 3.7 to 5.7 g/cm3) and in critical current density (from 28 to 60 A/cm2 in zero field and at liquid-nitrogen temperature) is observed, while the critical temperature remains practically unchanged (−104 K).

Key words

superconductors Bi-(Pb)-Ca-Sr-Cu-O X-ray diffraction electrical resistivity critical current density SEM a.c. susceptibility 

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Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • Gh. Aldica
    • 1
  • M. Popescu
    • 1
  • E. Cruceanu
    • 1
  • L. Miu
    • 1
  • J. Jaklovszky
    • 1
  • S. Mandache
    • 1
  1. 1.Institute of Physics and Technology of MaterialsBucharest-MăgureleRomania

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