Electrochemical topotactic oxidation of nonstoichiometric perovskites at ambient temperature

Abstract

Different approaches to describe nonstoichiometry in perovskite-related oxides, oxygen diffusion models and kinetic data on electrochemical intercalation of oxygen in perovskite-related oxides are considered in the present study. It is demonstrated that the formation of microheterogeneous systems is characteristic of nonstoichiometric perovskite-related oxides. The adequate models should be considered for the proper characterization of the low temperature oxygen transport in oxides. These models should account for the high concentration of the high diffusivity paths in the sample. For microdomain textured Ca0.5Sr0.5FeO2.5 perovskite as example, the kinetic analysis of electrochemical oxygen intercalation is carried out.  2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.