Oxygen transport in La0.6Sr0.4Co0.2Fe0.8O3-delta

Oxygen transport and oxygen surface reaction measurements have been obtaine d for La0.6Sr0.4Co0.2Fe0.8O3-delta using the conductivity relaxation techni que. These measurements are compared with tracer diffusion coefficients and surface exchange coefficients obtained for the same material. The change i n oxygen stoichiometry of this material with temperature and oxygen partial pressure has been demonstrated. The values derived from these experiments have been used to calculate the theoretical oxygen fluxes and close agreeme nt has been found with actual oxygen fluxes obtained from permeation experi ments through a dense La0.6Sr0.4Co0.2Fe0.8O3-delta sample using a modified Wagner model. (C) 1999 Elsevier Science B.V. All rights reserved.