High critical currents in Bi-2223 phase bars☆

Abstract The critical current I c and the critical current density J c of Bi-2223 phase bars have been found to depend on the mass density of the bars. Bars densified using a cold isostatic pressing (CIPing) process have been obtained with transport critical currents of > 150 A with J c levels up to ≈ 10 3 A cm −2 at 77 K in the absence of an applied magnetic field. Bending or kinking of the grains may promote densification during CIPing of a sintered bar.