Thermodynamic Modeling and Calculation of Phase Equilibria in the Strontium–Calcium–CopperOxygen System at Ambient Pressure

Abstract

The phase‐diagram and thermodynamic data on the Sr–Ca–CuO system at a total pressure of 105 Pa (1 bar) are reviewed and assessed. Gibbs energy functions for the (Sr,Ca) solid solutions and the liquid are optimized, and a consistent thermodynamic description is presented. Calculated phase relations are shown in various isothermal and isoplethal sections and compared to experimental data. Special attention is given to the stability of the infinite‐layer compound, as a function of temperature and oxygen partial pressure.