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Improved critical current densities in MgB2 tapes fabricated through an ex situ process using powders treated in various chemical solutions

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Abstract

We have studied grain coupling and critical current density (Jc) in ex situ processed Fe-sheathed MgB2 tapes fabricated by a powder-in-tube (PIT) technique, using MgB2 powder soaked in various chemical solutions. The grain coupling and the Jc are strongly influenced by the chemical solutions. Compared with the chemical treatment in a benzene solution of benzoic acid, the use of a cyclohexane solution of benzoic acid doubles the Jc value. Cyclohexane is less stable and hence effectively removed from the surface of MgB2 grains, bringing about the improved coupling of grains and the Jc enhancement.

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Acknowledgments

The authors cordially thank Dr. Nakane for assistance of the Ic measurements and the helpful discussions. This research was supported by a Grant-in Aid for Scientific Research (C) from Japan Society for the Promotion of Science (No. 18580323).

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Authors and Affiliations

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

    H. Fujii & K. Togano

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

    K. Ozawa

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  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 MgB2 tapes fabricated through an ex situ process using powders treated in various chemical solutions. Journal of Materials Research 23, 507–514 (2008). https://doi.org/10.1557/JMR.2008.0059

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  • DOI: https://doi.org/10.1557/JMR.2008.0059

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