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

Published online by Cambridge University Press:  31 January 2011

H. Fujii ,
K. Togano  and
K. Ozawa
H. Fujii*
Affiliation:
Superconducting Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
K. Togano
Affiliation:
Superconducting Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
K. Ozawa
Affiliation:
Photocatalytic Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
*
a) Address all correspondence to this author. e-mail: [email protected]
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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.

Keywords

SuperconductingMicrostructureGrain size
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 2 , February 2008 , pp. 507 - 514
Copyright
Copyright © Materials Research Society 2007

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References

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