Significantly enhanced critical current densities in MgB2 tapes made by a scaleable nanocarbon addition route

By Yanwei Ma, Xianping Zhang, Gen Nishijima, Kenji Watanabe, S. Awaji, X. Bai. 2006

185 citations recorded by the source corpus.

Nanocarbon-doped Fe-sheathed MgB2 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 9T. At 4.2K, the transport Jc for the 5at.% doped tapes reached 1.85×104A∕cm2 at 10T and 2.8×103A∕cm2 at 14T, 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 MgB2 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 MgB2 tape is very promising for high-field applications.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/71232e0dab830370a159f61cf271b2cfdc345b8a