Large irreversibility field in nanoscale C-doped MgB2/Fe tape conductors

Yanwei Ma, Xianping Zhang, S. Awaji, Dongliang Wang, Zhaoshun Gao, G. Nishijima, K. Watanabe

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24 Citations (Scopus)


We investigated the effect of nanoscale C doping on the critical current density Jc and irreversibility field Birr of Fe-sheathed MgB2 tapes prepared by the in situ powder-in-tube method. The tapes were heat treated at 600-950 °C for 1h. Higher values of Jc and Birr were seen for 5at.% C-doped MgB2 tapes at higher sintering temperatures. The C-doped samples sintered at 950 °C showed the highest Birr, for example at 4.2K the Birr reached 22.9T. In particular, at 20K, Birr for the C-doped tape achieved 9T, which is comparable to the upper critical field of the commercial NbTi at 4.2K. This role of nanosized C particles can be very beneficial in the fabrication of MgB2 tapes for magnetic resonance imaging applications at 20K.

Original languageEnglish
Article numberL01
Pages (from-to)L5-L8
JournalSuperconductor Science and Technology
Issue number3
Publication statusPublished - 2007 Mar 1


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