The effect of additive on the high- (2223) phase of Bi-Pb-Sr-Ca-Cu-O system superconductors

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Abstract
The effect of additive on the high- superconducting materials of the Bi-Pb-Sr-Ca-Cu-O system (2223 phase) has been studied for samples prepared by the sintering reaction technique under , ambient and Ar-7.7% atmospheres. The d.c. electrical resistivity and critical current density and the a.c. magnetic susceptibility were measured by means of the standard four-point probe technique and the inductance method, respectively. It was found that the addition of a small amount of enhances slightly both the critical transition temperature and the current density and decreases the magnetic shielding effect.