The alternating current (ac) frequency responses for several sulfide ionically conductive glasses were investigated in the frequency range from 1 kHz to 1 GHz, which corresponds to the Larmor and probing frequencies for nuclear magnetic resonance (NMR) relaxation experiments. The additional conductivity under high frequency ac fields showed Arrhenius behavior in the temperature range studied (25 to 95~ A frequency dependence of activation energy, Etc(~, for the additional conductivity was observed. Ere(J) showed a plateau region with an ac frequency range covering the NMR Larmor frequencies. NMR spin echo T2 experiments were carried out. The static quadrupolar and the heteronuclear dipolar contributions to the NMR lineshape were circumvented by the spin echo T2 experiments. The activation energies obtained, ETa, were consistent with Eto(]) plateau values for each glass composition. The consistency of these two experiments suggests that the additional conductivity is caused by the forced short-range motion of the mobile ions, while the NMR relaxation experiments characterize the short range thermal motion in the temperature range of 220 to 380 K. Based on the experimental observations of this study combined with the concepts from the Anderson-Stuart model, the weak electrolyte theory and the ion-ion repulsion models~ a simple qualitative interpretation for the ionic conduction in glasses is proposed. The ionic motion in glasses is controlled by: (i) the coulombic attraction energy, Go, between the ion under consideration and its oppositely charged environment; (ii) the strain energy, Gs, for the ion going through a bottleneck; and (iii) the mobile ion-ion repulsion energy, Gr.Alternating current (ac) electric conductivity is a dynamic response of charges and their environment toward the applied dynamic electric field. The term "dynamic response" or "relaxation in time domain" is used to denote "the time-dependence of self-adjustment" of a system to a new equilibrium when an external electric field is changed. A simple-exponential-relaxation-function (SERF) for dielectric response of materials was introduced by Debye (1) in 1929. However, it was frequently found that many materials do not exhibit SERF in response to a dynamic applied field such as mechanical, electrical, magnetic, etc.The nonsimple-exponential-relaxation-function (NSERF) of "elastic after-effect" on solids was reported as early as 1893 by Wiechert (2). A distribution of relaxation times (DRT) was first used to explain NSERF in dielectrics by Wagner (3) in 1913 and further developed by Yager (4) in the form ofa Gaussian distribution in 1936. The DRT was attributed to the potential-well distribution in solids by Carton (5) in 1946. Meanwhile, the temperature dependence of solid dielectrics (glass electrolyte) was studied by Gevers and du Pre (6) based on a distribution of activation energies (DAE), which resulted in a temperature dependent activation energy and DRT. The DRT and DAE (or EDAE, exponential distribution of activation energy) on solid-sta...
