Abstract
A perovskite-based electrolyte, Ca-substituted YAlO 3 , has been synthesized by the citrate gel process. The conductivity of Y 0.9 Ca 0.1 AlO 3 - δ has been studied by AC impedance spectroscopy in controlled atmospheres in the temperature range 300–800 °C. The material has been found to be a mixed conductor with dominant p-type electronic conduction at elevated temperatures and a combined protonic conduction below 600 °C in wet conditions. The H/D isotope effect on conductivity confirms the presence of protonic conductivity between 400 and 600 °C.
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