Abstract
High-T c superconducting ceramics of formula Bi0.8Pb0.2SrCaCu x O y (x=1.5, 1.8 and 2.0) were prepared by using the melt-quenching method, and the effect of copper content on glass formation and superconductivity was examined. It was found that the composition withx=1.5 had a tendency to form a glass and Bi2(Sr, Ca)2CuOy crystals tended to precipitate easily during the rapid quenching of melts in the compositions withx=1.8 and 2.0. It was found from the temperature dependence of a.c. complex susceptibility that the intergrain coupling of superconducting crystals in the samples obtained was weak, but the weak coupling was improved by increasing the annealing time. The superconducting glass-ceramics Bi0.8Pb0.2SrCaCu1.5Oy exhibited superconductivity with aT c (zero) of 106 K and aJ c of 250 Acm−2.
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Komatsu, T., Sato, R., Meguro, H. et al. Effect of copper content on glass formation and superconductivity in the Bi-Pb-Sr-Ca-Cu-O system. J Mater Sci 26, 683–688 (1991). https://doi.org/10.1007/BF00588304
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DOI: https://doi.org/10.1007/BF00588304