Abstract
The thermodynamic stabilities of reduced, perovskiterelated cuprates with the BaLa4Cu5O13.1−x structure were investigated using differential scanning calorimetry techniques. For 0 < x 0.6 the partial molar enthalpy of oxygen in the structure is constant at ‐187.4 kJ/mol O2. This value is almost identical to those reported for other perovskite cuprates. These results suggest that −190 kJ is a reliable value for the oxidation of Cu from 2+ to 3+ and can be used with confidence in calculations of the stabilities of the p‐doped perovskite cuprates. Anomalously large enthalpies measured for samples prepared with higher values of x under forming gas probably result from trace contaminants of Cu metal.
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