Oxygen permeation measurements were carried out on La0.8Sr0.2Ga0.75Mg0.15Co0.10O3±δ specimens, having various thicknesses, at 673 to 1173K under various gradients of O partial pressure. The open-circuit cell voltage was measured simultaneously. It was shown that these compositions were characterized by a high O permeation rate, and thus by a high electronic conductivity. An electrode polarization effect was experimentally demonstrated, and the influence of the measurement conditions upon the degree of the electrode polarization effect was studied. In particular, the influence was found to be smaller at higher O partial pressures in the cathode (O-rich) compartment, while a change in PO2 on the anode (O-lean) side of the permeation cell did not lead to any electrode polarization.

Oxygen Permeation Studies on La0.8Sr0.2Ga0.75Mg0.15Co0.10O3±δ. B.Khorkounov, H.Näfe: Ionics, 2006, 12[3], 191-8