Chemical stability of barium indate: effect of vanadium doping

Barium indate (Ba₂In₂O₅) is a known proton conductor at intermediate temperatures. Partial substitution for In³⁺ by higher valent V⁵⁺ ions led to the stabilization of the Ba₂In₂O₅ cubic phase at lower temperatures. In the present work Vanadium substituted Barium Indate, Ba₂In_2-xV_xO_5+x solid solutions were synthesized by ceramic route and their stability was studied using XRD technique. At high temperature, in presence of moisture indium leached out as In(OH)₃, whereas in presence of CO₂ barium comes out as BaCO₃ from Ba₂In₂O₅. The effect of vanadium substitution in Ba₂In₂O₅ on its chemical stability was demonstrated. The hydrated composition of the above oxides exhibit enhanced stability. The above experiment suggests for enhanced stability for vanadium doped barium indate as compared to pristine barium indate