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Improved critical current densities in ex situ processed MgB2 tapes fabricated with chemically treated powder

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Abstract

Fe-sheathed MgB2 tapes were fabricated using powder chemically treated through an ex situ process employing a powder-in-tube (PIT) technique. The treatment of MgB2 powder in a benzene solution of benzoic acid caused the pulverization and disappearance of large grains. Compared with the pristine powder without treatment, the tape made from this powder showed a fivefold increase in critical current density (Jc) in 10 T. This was due to the pulverization of grains by the chemical treatment and the removal of surface MgO layers from MgB2 grains by dissolution in the acid solution. The removal of MgO layers was effective in promoting substitution of carbon from the solvent for boron.

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Authors and Affiliations

  1. Superconducting Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan

    H. Fujii & K. Togano

  2. Photocatalytic Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan

    K. Ozawa

Authors
  1. H. Fujii
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  2. K. Togano
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  3. K. Ozawa
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Correspondence to H. Fujii.

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Fujii, H., Togano, K. & Ozawa, K. Improved critical current densities in ex situ processed MgB2 tapes fabricated with chemically treated powder. Journal of Materials Research 22, 1281–1285 (2007). https://doi.org/10.1557/jmr.2007.0159

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  • DOI: https://doi.org/10.1557/jmr.2007.0159

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