The perovskite proton conductor, SrCe1-xYxOy, where x ranged from 0.025 to 0.20 and y was equal to 3-½x, was characterized by using X-ray diffraction and alternating-current impedance spectroscopy. The results of X-ray diffraction studies revealed a decrease in lattice volume with increasing Y content. Conductivity studies were performed as a function of the O partial pressure, under a partial water-vapour pressure of 0.007atm. The total conductivity was separated into various components, and regions of ionic and p-type conduction were identified. At 800C, under a water-vapour partial pressure of 0.007atm, the ionic conductivity exhibited a maximum at an x-value of 0.10, and attained a value of 0.005S/cm. The conductivity component which appeared at low O partial pressures, and which could be regarded as being protonic rather than n-type, decreased with dopant content.

Structural and Electrical Characterisation of Sr(Ce,Y)O3. R.J.Phillips, N.Bonanos, F.W.Poulsen, E.O.Ahlgren: Solid State Ionics, 1999, 125[1-4], 389-95