AC SUSCEPTIBILITY STUDY OF THE INTERGRANULAR AND INTRAGRANULAR PROPERTIES IN (BI,PB)2223 SUPERCONDUCTOR

The temperature and amplitude of AC field dependencies of both inter- and intragranular T-p and T-g temperatures of the imaginary peaks of c hi '' has been studied for a sintered single phase (Bi,Pb):2223 superc onductor. The AC field dependencies for T-p and T-g and the relation b etween inter-and intragrain force densities were discussed by using Mu ller critical-state model. From the chi ''(T) curve, the values of int ergrain magnetic critical current density J(cJ) was obtained via the a pplication of Bean's critical state model. J(cJ)(T) dependence near T- c agree with the assumption of SNS intergrain junctions.