FABRICATION AND CHARACTERIZATION OF BI1.84PB0.34SR1.91CA2.03CU3.06O10SUPERCONDUCTORS PREPARED BY A WET TECHNIQUE

We have carried out measurements of resistivity on Bi1.84Pb0.34Sr1.91C a2.03Cu3.06O10 granular samples prepared by the liquid ammonium nitrat e method. The standard four-probe technique was used to measure the re sistivity and the critical current of the specimen. We estimated the i rreversibility line from the broadening of the resistive-superconducti ng transition in external DC magnetic fields up to 447 mT for the samp le fabricated. A non-linear Arrhenius plot of resistive tail has been found. The power law relation B-R(irr)=B-0(1-T/T-c)(3/2) gives a good fit to OUT data Obtained from zero-resistivity temperature in selected magnetic fields. We have also characterized the prepared samples in t erms of XRD, SEM and critical currents. (C) 1998 Elsevier Science S.A.