Abstract
The geometry of hydrogen intercalation sites in rutile TiO2 has been examined with first principles calculations. The calculations predict a new intercalation site, which is consistent with current experimental data. The apparent contradictions between spectroscopic, diffraction and magnetic resonance data are resolved by taking into account the strong local distortions of the structure induced by localization of charge donated by hydrogen. In particular the predicted OH vibrational frequency is in excellent agreement with the experimentally measured value. A similar local geometry is predicted in the presence of trivalent counter ions but with a preferential site occupancy consistent with the local symmetry implied by spectroscopic measurements of aluminium substituted titania.
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Koudriachova, M.V., Harrison, N.M. & de Leeuw, S.W. Hydrogen Intercalation Sites in Rutile Predicted from Ab Initio Calculations. MRS Online Proceedings Library 813, 341–346 (2004). https://doi.org/10.1557/PROC-813-H3.4
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DOI: https://doi.org/10.1557/PROC-813-H3.4