Large transport critical currents in dense Fe- and Ni-clad MgB2 superconducting tapes

We report on the preparation of dense monofilamentary MgB2/Ni and MgB2/Fe tapes with high critical current densities. In annealed MgB2/Ni tapes, we obtained transport critical current densities as high as 2.3*105 A/cm2 at 4.2 K and 1.5 T, and for MgB2/Fe tapes 104 A/cm2 at 4.2 K and 6.5 T. To the be...

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Bibliographic Details
Published in:arXiv.org 2001-06
Main Authors: Suo, HongLi, Beneduce, Concetta, Dhalle, Marc, Musolino, Nicolas, Genoud, Jean-Yves, Flukiger, Rene
Format: Article
Language:English
Subjects:
Annealing
Critical current density
Densification
Iron
Magnesium compounds
Nickel
Sheaths
Superconducting tapes
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Summary:We report on the preparation of dense monofilamentary MgB2/Ni and MgB2/Fe tapes with high critical current densities. In annealed MgB2/Ni tapes, we obtained transport critical current densities as high as 2.3*105 A/cm2 at 4.2 K and 1.5 T, and for MgB2/Fe tapes 104 A/cm2 at 4.2 K and 6.5 T. To the best of our knowledge, these are the highest transport jc values at 4.2 K reported for MgB2 based tapes so far. An extrapolation to zero field of the MgB2/Fe data gives a critical current value of ~ 1 MA/cm2, corresponding to an critical current value well above 1000 A. The high jc values obtained after annealing are a consequence of sintering densification and grain reconnection. Fe does not react with MgB2 and is thus an excellent sheath material candidate for tapes with self-field jc values at 4.2 K in excess of 1 MA/cm2.
ISSN:2331-8422
DOI:10.48550/arxiv.0106341