THE BAO-CU-CUO SYSTEM - SOLID-LIQUID EQUILIBRIA AND THERMODYNAMICS OFBACUO2 AND BACU2O2

The effects of composition, temperature (T) and O-2 partial pressure ( p[O-2]) on solid-liquid equilibria were determined experimentally for most of the phase fields in the BaO-Cu-CuO system. These relationships are illustrated in both a p[O-2]-10(4)/T diagram and in ternary phase diagrams. Thermodynamic values reported for BaCuO2 and BaCu2O2 by Vor onin and Degterov [1-3] were verified via equilibria involving oxides, BaCO3, O-2, and CO2. The T-p[O-2]-y interdependence was determined fo r Ba2CuO3+y.