Analysis of the co-doping effect of graphene and nano-Ni on grain connectivity and critical current density in MgB2 superconductors

MgB 2 bulks codoped with graphene and nickel with a composition of Mg 1−x Ni x B 1.9 G 0.1 (x = 0.02, 0.04 and 0.06) have been synthesized by an in situ reaction method. The combination effect of graphene and Ni codoping on microstructure, critical current density ( J c ) and irreversibility field (...

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