Water uptake in a new perovskite-like compound, BaTh0.6In0.4O2.8+y/2Hy, was measured in situ, by means of thermogravimetric analysis at various temperatures and water-vapour pressures. The grain-interior conductivity of pellet samples was measured in the dry state, and for proton concentrations of 2.3, 3.3 or 3.7% in the wet state, by using impedance spectroscopy. At temperatures ranging from 100 to 450C, where the proton concentration was frozen-in, the grain-interior conductivity increased linearly with the proton concentration. It was roughly a factor of 50 higher than that in the dry state. The activation energy for proton conduction was found to be 0.65eV.

Proton Conductivity in Ba(Tb,In)O3, a New Compound with the Simple Perovskite-Like Structure. R.R.Arons: Journal of the European Ceramic Society, 1999, 19[6-7], 811-4