Abstract
Abstract Samples of Bi2-xPbxSr2Ca2Cu3O10 superconductor were prepared with different Pb concentrations, each concentration being subjected to different sintering times. This was done to investigate the corresponding effect on the microstructure and hence the superconducting behaviour. The samples were subjected to XRD, scanning electron microscopy (SEM), dc resistance and microwave surface resistance measurements. XRD measurements show the complex variation of percentage volume of high-Tc phase and evolution of peaks of other impurity phases with change in fabrication parameters. Addition of Pb and prolonged sintering upto a certain limit are found to be effective in the synthesis of the high-Tc phase. SEM photographs revealed the surface structure and grain size. Proper choice of Pb and sintering time was possible from the characterization results. DC resistance of the samples was determined by four-probe technique and microwave surface resistance was determined by cavity perturbation technique. Characte...
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