Proton conduction was studied in single-phase La0.6Ba0.4ScO2.8 which had a cubic perovskite structure. An endothermic peak was observed in the differential thermal analysis curve, and a weight loss was observed in the thermal gravimetric plot for an as-sintered sample between 340 and 410C during heating in a dry N atmosphere. These results were attributed to the dehydration of water which might otherwise have been incorporated into O vacancies during cooling after sintering. In a wet N atmosphere, a conductivity plateau was observed, between 450 and 300C, in a plot of log[σT] versus reciprocal temperature. The conductivity which was measured in a dry atmosphere decreased linearly over the measured temperature range, thus implying that proton conduction predominated below 450C.

Proton Conduction in (La,Ba)ScO3 Cubic Perovskite. S.Kim, K.H.Lee, H.L.Lee: Solid State Ionics, 2001, 144[1-2], 109-15