Oxygen Release from Grossly Nonstoichiometric SrCo0.8Fe0.2O3−δ Perovskite in Isostoichiometric Mode

The kinetics of oxygen release from grossly nonstoichiometric perovskite SrCo 0.8 Fe 0.2 O 3−δ (SCF) with mixed conductivity chosen as a model object was studied for the first time using the oxygen partial pressure relaxation technique . The use of isostoichiometric conditions during the investigation of the oxygen exchange in SCF characterized by a wide homogeneity region made it possible to get information that cannot be obtained using traditional measurements under isobaric conditions. This approach allowed us to discover a kinetic compensation effect: successive oxygen release from SCF was found to result simultaneously in the increase of the apparent activation energy and pre-exponential factor of the reaction rate.