The synthesis of high- T c Bi(Pb)-Sr-Ca-Cu-O superconductors is reported in this Letter. Zero resistance is attained at 110 K for the samples sintered at 845°C for 200–300 h. The best sample is obtained after 300 h sintering. The d c magnetic susceptibility measurement shows the presence of 53% of a high- T c phase and 4% of a low- T c phase in terms of the sample-volume ratio. The T c decreased from 110 K to 108 K after a few days, suggesting that the T c =110 K state is metastable. The synthesis of the high- T c phase is studied from the viewpoint of sintering time, gas atmosphere, quenching and annealing procedures, and the Pb content in the original mixed materials.
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Narumi et al. (1989) studied this question.
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