We studied the Ti doping effect on the superconducting properties and microstructure of sintered MgB 2 bulk polycrystals. Using Ti as a sintering assistant, we have fabricated MgB 2 bulk materials consisting of fine 10 nm scale particles and achieved a high J c of 1 MA/cm 2 in self-field and 3 × 10 5 A/cm 2 in 1 T at 20 K. The large enhancement of J c is explained by the excellent connection between grains and the high density of pinning centers served by both grain boundaries and MgO nanoparticles.
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Zhao et al. (2002) studied this question.
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