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Pure and lithium-doped Bi2Sr2CaCu2Ox silver-clad tapes

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Abstract

Silver-clad tapes with transport Jc values to 105 A/cm2 at T-4.2K were produced by a powder-in-tube process. Moderate reductions per pass and proper tape thicknesses were essential for producing good conductors. Partial-melt sintering, followed by a solid-state heat treatment, produced microstructures consisting of large, well-aligned 2212 grains and alkaline-earth cuprate phases. The deleterious effects of these second phases were minimized by proper heat treatments, but further reductions in the sizes and concentrations of these phases are needed to improve Jc values substantially. Lithium additions raised Tc, improved flux pinning, and lowered melting points. They offer hope that the presence of alkaline-earth cuprates can be limited through use of low-temperature heat treatments.

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Authors and Affiliations

  1. Materials and Components Technology Division, Argonne National Laboratory, 60439, Argonne, IL

    K. C. Goretta, C.-T. Wu, M. T. Lanagan & R. B. Poeppel

  2. Department of Nuclear Engineering, University of Illinois at Urbana-Champaign, 61801, Urbana, IL

    J. Schwartz & S. Wu

Authors
  1. K. C. Goretta
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  2. C.-T. Wu
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  3. M. T. Lanagan
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  4. R. B. Poeppel
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  5. J. Schwartz
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  6. S. Wu
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Goretta, K.C., Wu, CT., Lanagan, M.T. et al. Pure and lithium-doped Bi2Sr2CaCu2Ox silver-clad tapes. J. Electron. Mater. 22, 1289–1294 (1993). https://doi.org/10.1007/BF02818075

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