Oxygen semi-permeation properties of Ba1-xSrxFeO3-δ perovskite membranes
Abstract This work is focused on the evaluation of oxygen semi-permeation performances of free cobalt perovskite membrane materials, Ba1-xSrxFeO3-δ perovskites. A wide range of Ba and Sr contents was studied. The best performances were obtained for Ba0.9Sr0.1FeO3-δ perovskite membranes with oxygen fluxes of 4.1 10−3 mol.m−2.s−1 at 850 °C. For a better understanding of the rate determining step of oxygen transport through Ba1-xSrxFeO3-δ perovskite membranes (with x = 0.1, 0.5, and 0.7), the oxygen diffusion and oxygen desorption coefficients were determined using a specific method based on oxygen semi-permeation.