The morphological and electrical properties of yttrium (Y) and indium (In) doped barium cerate perovskites of the form BaIn0.3-xYxCe0.7O3-delta (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-delta 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 Baln(0.3-x)Y(x)Ce(0.7)O(3-delta) samples with an increase of In-doping. BaIn0.1Y0.2Ce0.7O3-delta was found to have relatively high conductivity as well as acceptable wet CO2 stability. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.