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Precipitation and pinning in Ca and Sr-Rich High-Tc superconducting “Bi2Sr2CaCu2O8” ceramics

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Abstract

From a consideration of the phase equilibrium diagram of the system Bi2O3-SrO-CaO-CuO, a simple annealing procedure was developed to precipitate Bi2+xSr2+xCuO6+d, Sr14Cu24O41−x, and Bi2Sr3O6 in high-temperature superconducting Sr-rich “Bi2Sr2CaCu2O8” ceramics and Ca2CuO3 and a liquid in Ca-rich “Bi2Sr2CaCu2O8” ceramics. The transformation results in an increase of the critical current density of which is believed to express improved pinning properties of the superconducting crystals, in particular an increased pinning energy, which reduces the probability for thermally activated depinning. Possible pinning centers which were introduced during precipitation of the second phases are the surface of the precipitates.

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Authors and Affiliations

  1. Max-Planck-Institut für Metallforschung, Heisenbergstr. 5, 70569, Stuttgart, Germany

    Peter Majewski & Fritz Aldinger

  2. Hoechst AG, D-65926, Frankfurt am Main

    Steffen Elschner

Authors
  1. Peter Majewski
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  2. Steffen Elschner
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  3. Fritz Aldinger
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Majewski, P., Elschner, S. & Aldinger, F. Precipitation and pinning in Ca and Sr-Rich High-Tc superconducting “Bi2Sr2CaCu2O8” ceramics. J. Electron. Mater. 24, 1937–1941 (1995). https://doi.org/10.1007/BF02653013

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  • DOI: https://doi.org/10.1007/BF02653013

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