Abstract
The properties of perovskite related oxides ABO3-δ exhibiting mixed ionic-electronic conductivity (MIEC) are strongly dependent on oxygen stoichiometry 3-δ. The complexity of the theoretical interpretation of kinetic experiments is associated with the significant dependence of the kinetic properties of MIEC oxides on δ. It is proposed to consider such grossly nonstoichiometric oxides having different oxygen stoichiometry as chemical homologues participating in the oxygen exchange reaction and forming a series continuous in δ. The continuous homologous series approach is considered using the example of SrFe0.98Mo0.02O3-δ. The equilibrium and kinetic properties of the oxide were studied by new methods of the oxygen partial pressure relaxation (OPPR) and quasi equilibrium oxygen release (QEOR). The power law dependence ∼ pn of the kinetic parameters on the equilibrium oxygen partial pressure is considered as the consequence of linear free energy relationship similar to the Brønsted-Evans-Polanyi relation.
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