The role of vanadium substitution in the oxygen sublattice disorder of BaNbMoO-based hexagonal perovskite oxide-ion conductors.

BaNbMoO-based hexagonal perovskite derivatives are promising oxygen-ion conductors for solid electrolytes in solid-oxide fuel cells and electrolysers. A thorough understanding of chemical substitution and its impact on structural features conducive to high ionic conductivity is fundamental for decreasing the operation temperature of such devices. Here, a new 7H polytype-based composition, namely BaNb V MoO, is investigated to assess the effect of vanadium substitution.