Abstract
DTA-DTG, X ray diffraction and metallographic measurements at different temperatures and partial oxygen pressure in the isoplethic cut “(Bi,Pb) 2Sr 2CuO xCaCuO 2”, were carried out to analyze the influence of partial constraint oxygen pressure on phase transformations. An isobaric invariant equilibrium has been found in the P o2 range 0.5–1. Supplementary phase appearing at invariant equilibrium is (Sr,Ca) 3Cu 5O y. That phase fixes oxygen and then the weight loss is stopped.
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