Synthesis, Short-Range Structure and Hydration Processes of Oxyhalides Ba<sub>2</sub>InO<sub>3</sub>X (X = F, Cl, Br) with Ruddlesden-Popper Structure

The oxyhalides Ba 2 InO 3 F , Ba 2 InO 3 Cl, and Ba 2 InO 3 Br were synthesized using the solid state method. It was found that the increasing of halide ion radius leads to the increase of lattice parameters and also caused to redistribution of indium-oxygen bond lengths. The possibility of water uptake was proved by thermogravimetry measurements. The presence of different forms of oxygen-hydrogen groups in the structure of hydrated oxyhalides was indicated by infrared spectroscopy.