Ion conductivity spectrum model for condensed media.

A dielectric response spectrum formula applicable to a medium with ionic conductivity is presented. An analytical expression for the ionic conductivity spectrum σ(ω) of a material with the vibration-diffusion particle motion is discussed. The residence time τR is introduced into the model to drive a non-zero static conductivity σ(0). A τR change within ∞-0 continuously transforms the vibrational σ(ω)-Lorentzian into the diffusion σ(ω)-Drude response of free independent particles. [ABSTRACT FROM AUTHOR]