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

In this paper we presented the X-ray PDF investigation of orthorhombic Ba2In2O5 and cubic Ba2In1.7P0.3O5.3 and Ba2In1.7S0.3O5.45 samples. Pure Ba2In2O5 was found to be properly described–at the local scale–by the orthorhombic average structure. Ba2In1.7P0.3O5.3 and Ba2In1.7S0.3O5.45 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.