Abstract
The conditions (temperature, pressure and time) for attaining equilibrium with oxygen fordifferent YBCO materials are reported. The equilibrium oxygen content was used in orderto determine more exact values for the enthalpies and entropies of interaction ofYBa2Cu3Oy with oxygen. Internal equilibrium in YBCO is proposed and is ableto explain the effects of ageing and low temperature annealing onTc. Homogeneity and transitions to superconductivity of ceramics having equilibrium andnon-equilibrium oxygen contents are discussed.
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