Mixed conductivity and oxygen permeation property in Pr2Ni0.75Cu0.25Ga0.05O4

were investigated. After examining various Ga concentrations, it was found that

cation excess composition of Pr2Ni0.75Cu0.25Ga0.05O4 achieved the highest oxygen

permeability of 298μmol/cm2min (6.68cc/cm2min) at 1273K from air to He with a

0.5mm thickness. The oxygen permeability of Pr2Ni0.75Cu0.25Ga0.05O4 increased

with increasing the activity of surface catalyst and the highest permeation was

achieved when La0.9Sr0.1Co0.8Fe0.2O3 was used for the surface catalyst. The oxygen

non-stoichiometry was further studied by using thermogravimetry. It was

confirmed that the excess amount of oxygen was introduced at high PO2 range,

which might be the origin of the high oxygen permeation rate in this oxide.

Defect Chemistry and Oxygen Permeation Property of Pr2Ni0.75Cu0.25O4 Oxide

Doped with Ga. T.Ishihara, K.Nakashima, S.Okada, M.Enoki, H.Matsumoto: Solid

State Ionics, 2008, 179[27-32], 1367-71