Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1298704 | Solid State Ionics | 2008 | 4 Pages |
Abstract
The decay curve of deuterium atoms implanted and the uptake curve of hydrogen atoms in perovskite oxide ceramics by exposure to water vapor at room temperature have been measured by means of the ERD technique with MeV He ion beam. The decay and uptake curves have been phenomenologically analyzed, based on the one way diffusion model for the D-H replacement. The D-H replacement rates in SrCe0.95Yb0.05O3 â δ (bulk), BaCe0.95Y0.05O3 â δ (bulk), BaCe0.8Sm0.2O3 â δ/Ce0.8Sm0.2O2 â δ(thin film) and BaZr0.84Y0.16O3 â δ/8YSZ(thin film) are found to be 6.9 Ã 10â 4/s, 2.0 Ã 10â 2/s, 1.0 Ã 10â 1/s and 3.0 Ã 10â 3/s, respectively. The difference among them are discussed 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, oxygen vacancy and doped trivalent impurity ions, which introduce donors and acceptors, respectively, thermally ionized at room temperature.
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Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
K. Morita, B. Tsuchiya, S. Nagata, K. Katahira, M. Yoshino, J. Yuhara, Y. Arita, T. Ishijima, H. Sugai,