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• W1990657127 endingPage "308" @default.
• W1990657127 startingPage "277" @default.
• W1990657127 abstract "Protonic conduction (σ) is a particular case of ionic conduction and can be characterised by the pre-exponential factor (σ0) and activation energy (Ea) in the expression σT = σ0exp - (Ea/kT). A correlation between σ0 and Ea for different types of protonic conductors such as hydrates, anhydrous compounds, ionic and superionic conductors is given, and various materials are classified according to their principal conductivity mechanism. In order to understand these mechanisms, it appears necessary to determine the structure of the rigid framework as well as thet of potentially mobile protonic species and the dynamic and conducting properties of the latter in the very broad frequency range 105–1013 Hz. In the identification of protonic species and in the determination of their configuration, vibrational (optical and neutron) spectroscopy appears particularly efficient; it is also useful in determining the nature and degree of structural disorder. The complex impedance spectroscopic methods, quasi-elastic neutron scattering and proton magnetic resonance, on the other hand, contribute to a better knowledge of proton dynamics. Such structural and dynamic information has been obtained for various materials representing different types of protonic conduction: the ion jumps mechanism in anhydrous and hydrated lattice is illustrated by oxonium (ammonium) β alumina and a low-temperature phase of hydrated uranyl phosphate (HUP), respectively; the quasi-liquid state, in the lattice and on the surface, by the high-temperature phase of HUP, H+(H2O)nβ (β″) alumina and Zr (HPO4)2·nH2O; and the proton transfer assisted by orientational disorder of the rigid framework by H3OClO4 and Cs-HSO4. The influence of the partial water pressure and electrical field on the electrical properties of protonic conductors via proton transfer between mobile species and rigid framework is also discussed." @default.
• W1990657127 created "2016-06-24" @default.
• W1990657127 creator A5041064899 @default.
• W1990657127 creator A5054126313 @default.
• W1990657127 date "1988-07-01" @default.
• W1990657127 modified "2023-09-30" @default.
• W1990657127 title "Proton transfer and superionic conductivity in solids and gels" @default.
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