Synthesis and characterization of BaIn0.3−xYxCe0.7O3−δ (x = 0, 0.1, 0.2, 0.3) proton conductors

The morphological and electrical properties of yttrium (Y) and indium (In) doped barium cerate perovskites of the form BaIn0.3−xYxCe0.7O3−δ (with x = 0–0.3) prepared by a modified Pechini method were investigated as potential high temperature proton conductors with improved chemical stability and conductivity. The sinterability increased with the increase of In-doping, and the perovskite phase was found in the BaIn0.3−xYxCe0.7O3−δ solid solutions over the range 0 ≤ x ≤ 0.3. The conductivities decreased from x = 0.3 to 0 while the tolerance to wet CO2 improved for BaIn0.3−xYxCe0.7O3−δ samples with an increase of In-doping. BaIn0.1Y0.2Ce0.7O3−δ was found to have relatively high conductivity as well as acceptable wet CO2 stability.