Effect of doping on the local structure of new block-layered proton conductors based on BaLaInO4

In this work, the effect of acceptor of La3+-sublattice and donor of In3+-sublattice doping on the local structure of proton conductor BaLaInO(4)with block-layered Ruddlesden-Popper structure was investigated. It was showed that both types of doping led to appearance of new kinds of the defects (oxygen vacancy and oxygen interstitial) and to the decrease in the tilting angles of [InO6] octahedra due to the expansion of unit cell in theabdirection. The formation of a less distorted structure provided facilitated oxygen-ionic and protonic transport and increased ionic conductivity.