Oxygen transport in perovskite and related oxides: A brief review

Perovskites and related oxides are a very important class of functional materials that exhibit a range of stoichiometries and crystal structures. The oxygen diffusion mechanisms and activation energies in these materials are highly influenced by the composition, stoichiometry and crystal structure. We review the significance of a range perovskite related oxides but focus on two characteristic materials: La 2NiO 4+ δ and LnBa 2Cu 3O 7− δ (where Ln = rare-earth cations). La 2NiO 4+ δ is considered as a cathode material for solid-oxide fuel cells, whereas LnBa 2Cu 3O 7− δ is the archetypal superconducting oxides.