Electrical conduction and oxygen transport in SrFeCo0.5Ox oxide membranes
Abstract Electrical and oxygen transport properties of SrFeCo 0.5 O x oxide were investigated at elevated temperatures. The electrica1 conductivity was found in the order of 20–10 S/cm in the temperature range of 1100–600°C. An abnormal region was observed at temperatures around 900°C in which electrical conductivity increased with decreasing temperature, which may be related to the undergoing of phase transformation. An oxygen permeation flux of 159×10 −8 mol/cm 2 ·s was measured in an air/helium gradient at 900°C. The acid treatment on the sintered oxide resulted in a considerable improvement of the oxygen permeability, indicating that the surface oxygen exchange limits the overall oxygen permeation process.