Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9781868 | Journal of Physics and Chemistry of Solids | 2005 | 10 Pages |
Abstract
For superionic and deformed perovskite-type H+-ion conductors, empirical relationships among atomic mass of host or substituted ion, H+-ion conductivity, ÏPR, activation energy, transition temperature Tc, etc. are proposed. We elucidate the roles of heavy host ion and specific crystal structures below and above the Tc on the H+-ion conduction by noticing a large amplitude of O-ion vibration mode arising from a large fourth order anharmonicity. We clarify the important role of strengthened ionic force for the host cation lattice at and above Tc on the H+-ion jumping, and interpret reasonably the ÏPR value depending on the concentration of doping ion, a large broadening of vibration band and an enhanced amplitude of OH-vibration mode, etc. We suggest the extension of this consideration to stabilized zirconium and superproton conductors, etc.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Kunio Wakamura,