Abstract
The role of preparation conditions and the effect of addition of Pb in Bi-Sr-Ca-Cu-O (BSCCO) superconductor, on theT c,J c and grain orientation have been studied. Calcination at a temperature higher than the melting point of Bi2O3 after the prereaction at 800°C leads to formation ofc-axis oriented nearly single phase material. The presence of lead yields a nearly highT c phase (2223) exhibiting a maximum transition temperatureT c=110 K and ΔT c=2 K. The addition of lead and grain orientation together result in an increase inJ c by nearly two orders of magnitude. The degradation behaviour was studied in terms of changes inT c,J c and structure on exposure to atmosphere up to 250 days. Samples with 0.6 Pb were found to be superconducting withT c=97 K even after 250 days. The highT c phase was stable against degradation. Our studies indicate that the degradation of leaded BSCCO is a surface phenomenon rather than bulk phenomenon.
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Gogia, B., Kashyap, S.C., Pandya, D.K. et al. Preparation and degradation behaviour of Bi-cuprate superconductors. Bull. Mater. Sci. 14, 217–222 (1991). https://doi.org/10.1007/BF02747318
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DOI: https://doi.org/10.1007/BF02747318