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  • 1 Université de Toulon et du Var Laboratoire de Physico-Chimie des Matériaux et du Milieu Marin, LPCM3, Equipe des Matériaux à Finalité Spécifique BP 132-83957 La Garde Cedex France
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Abstract  

DTA-DTG systematic study of highT c superconducting phase (Bi,Pb)2Sr2CaCu2O8+x, with and without lead, shows a quantitatively opposite variation of oxygen stoechiometry on heating and cooling. Multiplate sample container, designed for the study, allowed to dissociated PbO loss from oxygen variations. Phases transformations have been studied under severalP O2 by scanning DTA and DTG. Oxygen variations evolution has been evaluated by isothermal TG. The results proved that phase diagram representation must take into consideration theP O2 coordinate.