Oxygen Ion and Proton Transport in Alkali-Earth Doped Layered Perovskites Based on BaLa<sub>2</sub>In<sub>2</sub>O<sub>7</sub>
Nataliia Tarasova,
Anzhelika Bedarkova,
Irina Animitsa,
Ksenia Belova,
Ekaterina Abakumova,
Polina Cheremisina,
Dmitry Medvedev
Affiliations
Nataliia Tarasova
Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Akademicheskaya St., 620066 Yekaterinburg, Russia
Anzhelika Bedarkova
Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Akademicheskaya St., 620066 Yekaterinburg, Russia
Irina Animitsa
Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Akademicheskaya St., 620066 Yekaterinburg, Russia
Ksenia Belova
Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Akademicheskaya St., 620066 Yekaterinburg, Russia
Ekaterina Abakumova
Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Akademicheskaya St., 620066 Yekaterinburg, Russia
Polina Cheremisina
Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Akademicheskaya St., 620066 Yekaterinburg, Russia
Dmitry Medvedev
Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Akademicheskaya St., 620066 Yekaterinburg, Russia
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 ~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 °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.
