Study of the oxygen exchange kinetics in the nonstoichiometric oxide SrFeO3-δ under isostoichiometric conditions using the oxygen partial pressure relaxation technique

The kinetics of oxygen exchange in the nonstoichiometric strontium ferrite SrFeO3-delta with the structure of cubic perovskite was studied by the oxygen partial pressure relaxation technique in the isostoichiometric regime at temperatures of 500-900A degrees C in a range of delta from 0.24 to 0.44. An increase in the oxygen nonstoichiometry delta was accompanied by a decrease in the rate of sample relaxation and by an increase in the apparent activation energy of oxygen exchange.