The enhancement of O permeation in calcia-stabilized zirconia, by doping with CeO2, was studied. Tubular specimens were used to measure bulk O permeability, from a N2 + O2 gas mixture, and into He. Mere O leakage was estimated from the extent N leakage into He. The permeation of O was measured at 1100 to 1800K in [(ZrO2)1-x (CeO2)x]0.9(CaO)0.1, where x ranged from 0.1 to 1. It was shown that the O permeability, when normalized by the temperature and the O partial pressures inside and outside the specimen, increased exponentially with temperature and with x-values of up to 0.5. The permeability values tended to saturate at higher x-values.

Y.Nigara, K.Watanabe, K.Kawamura, J.Mizusaki, M.Ishigame: Journal of the Electrochemical Society, 1997, 144[3], 1050-9