Calculation of the activation energy for ionic conduction in glasses

Use of dielectric relaxation for measurements of surface energy variations during adsorption of water on mordenite

“…Anderson and Stuart [20] initially introduced the model. Elliott et al and co-workers [21][22][23] interpreted the motions of the cations in different types of ionic glasses. A statistical description has also been proposed [24] from the theory developed by Turnbull and Cohen [25,26].…”

The review of possible interrelations between ionic conductivity, internal friction and the viscosity of glasses and glass forming melts within the framework of Maxwell equations

“…Hakim and Uhlmann [91] proposed a small refinement of this model. The discussion of other possibilities of this model one can find in [92][93][94].…”

Distribution of ionic charge carriers and migration barriers in binary alkali silicate glasses

“…not in contact. A percolation path of contacting Q3 species begins to be established at x =0,16, (Elliott 1993), and so this marks the lowmodifier-content limit. Thus, for x ~< 0"16, we expect that M +-NBO ion pairs always remain separated (but each pair remains bound together).…”

“…When the modifier content is large (x > ff16), there is, on average, one NBO per octahedron. As a result, the path involving face-sharing octahedra becomes decorated with NBO sites forming a percolation path of connected NBO sites (Elliott 1993). This picture is somewhat reminiscent of the "channels" in the modified random network (MRN) picture of Greaves (1985), except that here we are more specific about the coordination polyhedra, and their connections, to the network modifier sites.…”

“…Let the energy of the M + ion in the ground state (position I or 2) be Eo and in the activated saddle-point state be Es.The activation barrier is therefore A'E ,= Es -Ea. If we consider Coulombic, polarization and overlap repulsion terms only, neglecting the strain-energy term which is very small, ~ (>1 eV (Rao et al 1993;Elliott 1993), and ffwe use an exponential form of the repulsion energy (Rao et a11993), then and…”