Phase stabilisation, chemical behaviour and protonic conductivity of vanadium doped Barium Indate for ITSOFC application

Abstract Barium indate (Ba2In2O5) is known to be a good proton conducting oxide at moderate temperatures. Vanadium substituted barium indate, Ba2In2-xVxO5+xsolid solutions were synthesized by ceramic route and their hydrated samples were prepared to evaluate their stability in presence of moisture. Partial substitution for In3+ by V5+ led to the stabilization of the Ba2In2O5 cubic form at lower temperatures. Their thermal as well chemical stability was studied using thermogravimetry and x-ray diffraction techniques. At high temperature, in presence of moistureindium leached out as In(OH)3, whereas in presence of CO2 barium comes out as BaCO3 fromBa2In2O5.The effect of vanadium substitution in Ba2In2O5on its chemical stability was demonstrated. As vanadium content increases the hydrated composition of the above oxides exhibit enhanced stability.