Oxygen Permeation Property in Nd Deficient Nd2NiO4 Mixed Oxide Doped with Cu and Ga

Oxygen permeation property in Nd deficient Nd2NiO4 was studied. The oxygen permeation rate increases with increasing Ga. Nd deficiency in Nd2NiO4 is also useful for increasing the oxygen permeation rate. The improved oxygen permeation rate could be assigned to the increased amount of excess oxygen and stabilizing a tetragonal structure at a low temperature. The oxygen permeation rate of Nd-1.9(Ni0.75Cu0.25)(0.95)Ga0.05O4 achieved a value of 3.6 cm(3)/min cm(2) from air to He at 1273 K with 0.5 mm thickness and this value belongs to the highest class in the reported oxygen permeation rate. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3418611] All rights reserved.