Protonic conduction in the single crystals of SrZrO3 and SrCeO3 doped with Y2O3
Abstract Single crystals of SrZrO 3 and SrCeO 3 doped with Y 2 O 3 were made by floating zone method and their electric conductivities were measured. The bulk protonic conduction is confirmed for both crystals. The activation energies are evaluated to be 0.45 and 0.56 eV for SrZr 0.95 Y 0.05 O 3−α and SrCe 0.95 Y 0.05 O 3−α , respectively. From the isotopic effect, it is found that t proton tunneling effect is negligible and the protonic migration is well explained by the thermal activation mechanism. Infrared absorption measurements show that the proton is bound in the interstitial sites by oxygen ions.