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Isothermal melt processed Bi-2212/Ag tapes containing MgO and Al2O3 additions

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Abstract

The development of the superconducting phase in melt-processed Bi-2212 tapes depends on controlling the development of solid phases in the partial melt and the conversion of the partial melt into a highly-aligned superconducting phase. MgO and Al2O3 additions have been used with isothermal melt processing (IMP) for the grain refinement of phases in the partial melt and the prevention of secondary phase growth during solidification. Controlled solidification with reduced oxidation rates also significantly increased the transport properties of the tapes with or without the oxide additions. The optimal oxidation rate was found to depend upon the processing temperature. Critical current densities in excess of 100 kA cm−2 were obtained in tapes melt-processed below 800 °C.

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Authors and Affiliations

  1. MS-K763 and †MST-6 MS-G755 Los Alamos National Laboratory, Superconductivity Technology Center, Los Alamos, NM, 87545, USA

    N. V. Vo, T. G. Holesinger, P. S. Baldonado & W. L. Hults

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  1. N. V. Vo
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  2. T. G. Holesinger
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  3. P. S. Baldonado
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  4. W. L. Hults
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Vo, N.V., Holesinger, T.G., Baldonado, P.S. et al. Isothermal melt processed Bi-2212/Ag tapes containing MgO and Al2O3 additions. Journal of Materials Science: Materials in Electronics 11, 81–88 (2000). https://doi.org/10.1023/A:1008964422844

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