The ionic conductivity of O was studied in dense ceramic Cu3Ba2YO6+x samples by performing O permeation measurements at temperatures ranging from 600 to 850C, under O partial pressures of between 0.06 and 1atm. The method was based upon direct determinations of the steady flow of O through the specimen at constant temperature, with a small gradient of O chemical potential imposed along the sample. The activation energy, E, for O conductivity (diffusion coefficient) was determined for x-values of between 0.35 and 0.6. The dependence of the activation energy upon the O content in the tetragonal phase was found to be described by: E(eV) = 2.80 - 1.45x. This dependence was attributed to the interaction of mobile O ions.

M.V.Patrakeev, I.A.Leonidov, V.L.Kozhevnikov, V.I.Tsidilkovskii, A.K.Demin, A.V.Nikolaev: Solid State Ionics, 1993, 66[1-2], 61-7