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The structure and dehydration mechanism of the proton conducting oxideBa$_{2}$In$_{2}$O$_{5}$(H$_{2}$O)$_{x}$ are investigated by means of variabletemperature Raman spectroscopy together with inelastic neutron scattering. Atroom temperature, Ba$_{2}$In$_{2}$O$_{5}$(H$_{2}$O)$_{x}$ is found to be fullyhydrated ($x=1$) and to have a perovskite-like structure, which dehydratesgradually with increasing temperature and at around 600 $^{\circ}$C thematerial is essentially completely dehydrated ($x=0$). The dehydrated materialexhibits a brownmillerite structure, which is featured by alternating layers ofInO$_{6}$ octahedra and InO$_{4}$ tetrahedra. The transition from aperovskite-like to a brownmillerite-like structure is featured by ahydrated-to-intermediate phase transition at $ca.$ 370 {\deg}C. The structureof the intermediate phase is similar to the structure of the fully dehydratedmaterial, but with the difference that it exhibits a non-centrosymmetricdistortion of the InO$_{6}$ octahedra not present in the latter. Fortemperatures below the hydrated-to-intermediate phase transition, dehydrationis featured by the release of protons confined to the layers of InO$_{4}$tetrahedra, whereas above the transition also protons bound to oxygens of thelayers of InO$_{6}$ are released. Finally, we found that the O-H stretch regionof the vibrational spectra is not consistent with a single-phase spectrum, butis in agreement with the superposition of spectra associated with two differentproton configurations. The relative contributions of the two protonconfigurations depend on how the sample is hydrated.

Structure and dehydration mechanism of the proton conducting oxide Ba$_{2}$In$_{2}$O$_{5}$(H$_{2}$O)$_{x}$