OXYGEN PERMEATION MODELING OF LA1-YCAYCRO3-DELTA

The oxygen permeation current density through La0.75Ca0.25CrO3-delta w as calculated as a function of the oxygen partial pressure gradient us ing a random point defect model. The oxygen permeation current density depends on the oxygen partial pressure at the low oxygen partial pres sure side as J(O2-) is-proportional-to P(O2)-0.5 when the nonstoichiom etry of the perovskite at that side is small. The oxygen permeation cu rrent density is independent of the oxygen partial pressure at the hig h oxygen partial pressure side when the nonstoichiometry of the perovs kite at that side is small in comparison with the nonstoichiometry at the low oxygen partial pressure side. The result of this calculation d escribes also the Electrochemical Vapor Deposition process of this typ e of perovskite material.