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  • 1 Matériaux à Finalité Spécifique, Laboratoire de Physico-Chimie des Matériaux et du Milieu Marin, E. A. 1356 Université de Toulon-Var B. P. 132 83957 La Garde cedex France
  • 2 Laboratoire de Physico-Chimie des Matériaux Université Chouaib Doukkali B.P. 20 El Jadida Maroc
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TG-DTA and X-ray diffraction measurements at different temperatures and under different oxygen partial pressures were carried out on the species Bi1.6Pb0.4Sr2CuO6±x, Bi1.6Pb0.4Sr2CaCu2O8±y and Bi1.6Pb0.4Sr2Ca2Cu3O10±z to analyse the influence of the oxygen chemical potential on the phase transformations. A new phase was found at isobaric invariant equilibrium for 0.5≤ /PTot≤1 at 884°C. This new phase presents a buffer effect towards oxygen exchange between superconducting oxides and the gas phase.