Abstract
The oxygen exchange between the condensed phase(s) and the gas phase was studied as a function of temperature for superconducting phases of the system (Bi,Pb)-Sr-Ca-Cu-O.
An oxygen probe apparatus allowed confirmation that the variation in oxygen composition in the Pb2212 and Pb2223 superconducting phases is a reversible phenomenon on heating and cooling. It was demonstrated that the mass loss of both phases, for the 905 and 980°C isotherms, was due to the oxygen composition variation and to PbO loss (this latter phenomenon begin irreversible).
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Mansori, M., Favotto, C., Jardet, K. et al. Oxygen exchange study in phase transformations of superconducting bismuth cuprates (Pb2212 and Pb2223). Journal of Thermal Analysis 50, 401–407 (1997). https://doi.org/10.1007/BF01980500
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DOI: https://doi.org/10.1007/BF01980500