Insight into the local structure of barium indate oxide-ion conductors: An X-ray total scattering study

Abstract

In this paper we presented the X-ray PDF investigation of orthorhombic Ba₂In₂O₅ and cubic Ba₂In_1.7P_0.3O_5.3 and Ba₂In_1.7S_0.3O_5.45 samples. Pure Ba₂In₂O₅ was found to be properly described–at the local scale–by the orthorhombic average structure. Ba₂In_1.7P_0.3O_5.3 and Ba₂In_1.7S_0.3O_5.45 cannot be described, at the local scale, by a cubic symmetry. The PDFs of these two samples clearly showed a distorted atom arrangement in the short-range which can be described again with the orthorhombic symmetry found in pure barium indate.