Conductivity data were obtained by impedance spectroscopy of BaCe0.9Y0.1O3-δ at 100 to 900C. An Arrhenius plot of the data exhibited 2 distinct linear regions; thus suggesting that 2 different rate-limiting processes occurred in series, with a transition at about 250C. The decrease in conductivity did not appear to be due to dehydration. An activation energy for protonic transport of 0.26eV was deduced; based upon curve fitting of the high-temperature data. This was about half of the low-temperature value.

Proton Conductivity Measurements in Yttrium Barium Cerate by Impedance Spectroscopy. W.G.Coors, D.W.Readey: Journal of the American Ceramic Society, 2002, 85[11], 2637-40