The local structure and hydration processes of halogen-substituted perovskites based on Ba$_{4}$In$_{2}$Zr$_{2}$O$_{11}$

Halogen-substituted perovskites Ba$_{4}$In$_{2}$Zr$_{2}$O$_{10.95}$F$_{0.1}$ and Ba$_{4}$In$_{2}$Zr$_{2}$O$_{10.95}$Cl$_{0.1}$ are synthesized, and their single-phase composition is verified by X-ray diffraction analysis. Their ability of the studied phases to hydrate and form energetically unequal OH$^-$ groups is proved. It is found that introduction of halide ions leads to a decrease in the hydration degree with respect to the matrix composition, which is explained by a decrease in the crystal unit cell free volume Processes.