Significantly enhanced critical current densities in MgB 2 tapes made by a scaleable nanocarbon addition route

Yanwei Ma, Xianping Zhang, G. Nishijima, K. Watanabe, S. Awaji, Xuedong Bai

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182 Citations (Scopus)

Abstract

Nanocarbon-doped Fe-sheathed Mg B2 tapes with different doping levels were prepared by the in situ powder-in-tube method. Compared to the undoped tapes, Jc for all the C-doped samples was enhanced by more than an order of magnitude in magnetic fields above 9 T. At 4.2 K, the transport Jc for the 5 at. % doped tapes reached 1.85× 104 A cm2 at 10 T and 2.8× 103 A cm2 at 14 T, respectively. Moreover, the critical temperature for the doped tapes decreased slightly. Transmission electron microscopy showed a number of intragranular dislocations and the dispersed nanoparticles embedded within Mg B2 grains induced by the C doping. The mechanism for the enhancement of flux pinning is also discussed. These results indicate that powder-in-tube-processed Mg B2 tape is very promising for high-field applications.

Original languageEnglish
Article number072502
JournalApplied Physics Letters
Volume88
Issue number7
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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