Oxygen Ion and Proton Transport in Alkali-Earth Doped Layered Perovskites Based on BaLa2In2O7

Inorganic materials with layered perovskite structures have a wide range of physical and chemical properties. Layered perovskites based on BaLanInnO3n+1 (n = 1, 2) were recently investigated as protonic conductors. This work focused on the oxygen ion and proton transport (ionic conductivity and mobility) in alkali-earth (Sr2+, Ba2+)-doped layered perovskites based on BaLa2In2O7. It is shown that in the dry air conditions, the nature of conductivity is mixed oxygen-hole, despite the dopant nature. Doping leads to the increase in the conductivity values by up to similar to 1.5 orders of magnitude. The most proton-conductive BaLa1.7Ba0.3In2O6.85 and BaLa1.7Sr0.15In2O6.925 samples are characterized by the conductivity values 1.2.10(-4) S/cm and 0.7.10(-4) S/cm at 500 degrees C under wet air, respectively. The layered perovskites with Ruddlesden-Popper structure, containing two layers of perovskite blocks, are the prospective proton-conducting materials and further material science searches among this class of materials is relevant.

Automated summary

Inorganic materials with layered perovskite structures exhibit various physical and chemical properties. This study focuses on the oxygen ion and proton transport in alkali-earth doped layered perovskites based on BaLa2In2O7. Doping significantly enhances the conductivity values and the most proton-conductive samples exhibit high conductivity under wet air conditions.