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Recent advances in bismuth-based superconductors

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Abstract

Significant progress has been made in the development of high-critical-temperature (high-Tc) mono- and multifilament bismuth-based superconductors by the powder-in-tube (PIT) technique. High critical current density (Jc) has been achieved in both short- and long-length monofilament conductors. Jcs up to 1.2 × 104 A/cm2 were achieved in an 850 m long multifilament conductor. Pancake-shaped coils and test magnets, fabricated from long conductors, were characterized at various temperatures and applied magnetic fields. One such magnet containing 480 m of high-Tc tape generated a record-high field of 2.6 T at 4.2 K. Multifilament conductors appear to possess better mechanical properties and retain a higher percentage of their initial critical current under strain than monocore conductors, which is important for practical considerations. PIT processing of superconducting tapes with Ag-Al2O3 as the sheath material is perhaps another route to improve mechanical properties.

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Authors and Affiliations

  1. Argonne National Laboratory (ANL), Argonne, Illinois

    U. Balachandran Ph.D. (manager, ceramics section)

  2. ANL/Illinois Institute of Technology (IIT), USA

    A. N. Iyer M.S. & J. Y. Huang B.S.

  3. ANL/Northwestern University, USA

    R. Jammy M.S.

  4. Intermagnetics General Corporation (IGC), USA

    P. Haldar Ph.D. (senior engineer), J. G. Hoehn Jr. B.S. (development engineer), G. Galinski B.A. (research engineer) & L. R. Motowidlo Ph.D. (senior scientist)

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  1. U. Balachandran Ph.D.
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  2. A. N. Iyer M.S.
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  3. J. Y. Huang B.S.
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  5. P. Haldar Ph.D.
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  6. J. G. Hoehn Jr. B.S.
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  8. L. R. Motowidlo Ph.D.
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Balachandran, U., Iyer, A.N., Huang, J.Y. et al. Recent advances in bismuth-based superconductors. JOM 46, 23–25 (1994). https://doi.org/10.1007/BF03222657

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