Abstract
The coulometric titration data are utilized in order to calculate changes of oxygen partial entropy and enthalpy in PrBaCo2O5+δ with variations of oxygen content and temperature. The thermodynamic equilibrium of the cobaltite with the ambient gas phase is analyzed based on the interface of oxygen exchange and oxidation, and the intrinsic reaction of thermal excitation of Co3+ cations. The partial thermodynamic functions of the movable oxygen in PrBaCo2O5+δ are shown to be interrelated with the thermodynamic parameters of the defect formation reactions. The existence of a band gap of about 0.4eV in the electronic spectrum of the cobaltite follows from a favorable comparison of the calculated and experimental dependencies of the partial thermodynamic functions of the movable oxygen.
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