The decay curve of deuterium atoms implanted and the uptake curve of H atoms in perovskite oxide ceramics by exposure to water vapour at room temperature were measured by means of the ERD technique with MeV He ion beam. The decay and uptake curves were phenomenologically analyzed, based on the one way diffusion model for the D–H replacement. The D–H replacement rates in SrCe0.95Yb0.05O3−δ (bulk), BaCe0.95Y0.05O3−δ (bulk), BaCe0.8Sm0.2O3−δ/Ce0.8Sm0.2O2−δ (thin film) and BaZr0.84Y0.16O3−δ/8YSZ (thin film) were found to be 6.9 x 10−4, 2.0 x 10−2, 1.0 x 10−1 and 3.0 x 10−3/s, respectively. The difference among them were analyzed in terms of dipole induced water splitting model induced by Coulomb interactions of dipole charge of water molecule adsorbed at the surface with charges of the surface lattice defects, O vacancy and doped trivalent impurity ions, which introduce donors and acceptors, respectively, thermally ionized at room temperature.

A Water Splitting Model of Coulomb Interactions of Its Dipole with Surface Defects of Hydrogen Implanted Perovskite Oxide. K.Morita, B.Tsuchiya, S.Nagata,

K.Katahira, M.Yoshino, J.Yuhara, Y.Arita, T.Ishijima, H.Sugai: Solid State Ionics, 2008, 179[21-26], 793-6