Abstract
The complex ac susceptibility was measured as a function of temperature and ac field amplitude on rectangularbar shaped high-temperature superconductors with nominal composition ofBi1.6Pb0.4Sr2(Ca1−xNix)2Cu3Oδ (x = 0–0.10) superconducting samples prepared by the solid state reaction method. It isfound that as the amount of Ni doping increases, the critical temperatureTc slowly decreases. A small amount of Ni doping(x = 0.03) increases the intergranular critical currentjcm and the flux pinning of the Bi(Pb)-2223 system. The effective volume fraction of the grainsand the field dependence of the intergranular critical current density were estimated bycomparison of the maximum of the extracted matrix susceptibility and the correspondingcalculated data which was obtained from hysteresis losses employing the power law criticalstate model.
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