PHASE-EQUILIBRIA STUDY IN THE PARTIALLY OPEN CU-(O) AND ME-CU-(O) (ME=BA,BI,SR) SYSTEMS

Phase equilibria in the Me-Cu-(O) systems were studied using experimen tal and calculation procedures. XRD and DTA were used for experimental determination of thermodynamic data, For the calculation of the phase diagrams a mathematical solution of the equations resulting from the condition of thermodynamic equilibria in partially open systems was em ployed. As a result the series of phase diagrams of the SrO-CuOx, BiO1 .5-CuOx and BaO-CuOx pseudobinary systems for the various partial pres sures of oxygen are presented.