We prepared superconducting Bi0.8Pb0.2SrCaCu2O y ceramics using the melt quenching method and examined the effect of annealing conditions on the formation of high-T c phases. It was found from the changes in inductance and X-ray powder diffraction analyses that prolonged annealing at 830°C was very effective in increasing the volume fraction of high-T c phases. The samples annealed at 830°C for 200 h and 250 h in air exhibited superconductivity with a T c(zero)=100 K and critical current densities (77 K, zero magnetic field) of 35∼50 A/cm2.
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Komatsu et al. (1988) studied this question.
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