Abstract
Abstract Three correlationships are established among the optical dielectric constant e∞, Szigeti effective charge e∗s, transition temperature Tc, melting temperature Tm, and optical phonon frequency for many cubic fast ionic conductors. These relations suggest an intense influence of electronic energy state near the band gap to the origin of fast ionic conduction, dominant contribution of short-range or long-range forces to the mobile ion below Tc or to the cage ion above Tc. A curious temperature dependence for e∞ and e∗s values is also interpreted by considering anharmonic dynamical effective charge.
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