Laboratoire de Physico-Chimie du Matériau et du Milieu Marin, Matériaux à Finalité Spécifique (E.A. 1356), Faculté des Sciences et Techniques, Université de Toulon et du Var, B.P. 132, 83957 La Garde Cedex, France
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).