ION TRANSPORT IN HIGHLY NONSTOICHIOMETRIC OXIDES WITH PEROVSKITE-LIKE STRUCTURE

Solid solutions with nominal composition Pr1-xYxBaCo2-yAlyO6-δ where x = 0, 0.1 and y = 0, 0.1 were synthesized, phase purity of the samples obtained was confirmed by XRD analysis. Cobaltites’ equilibrium oxygen content was determined via combination of coulometric titration and thermogravimetry. Thermal expansion of Pr1-xYxBaCo2-yAlyO6-δ oxides was studied with the help of dilatometry. Oxygen permeability was measured in a specially equipped device. Theoretical model was proposed and used for explanation of the data obtained