The influence of the nature of halogen on the local structure and intercalation of water in oxyhalides Ba$_{2}$InO$_{3}$X (X = F, Cl, Br)

Oxyhalides Ba$_{2}$InO$_{3}$F, Ba$_{2}$InO$_{3}$Cl, and Ba$_{2}$InO$_{3}$Br, are synthesized, and their phase homogeneity is confirmed by the method of X-ray diffraction. The influence of the nature of a halide ion on the crystal-lattice parameters and on the In–O bond lengths is established. The ability of the studied phases to undergo hydration and formation of oxygen–hydrogen groups in their structure is proven.