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Electrochemical Impedance Spectroscopy and Raman studies are performed onfast ion conducting, AgI-Ag2O-MoO3 glasses, over a wide range of composition tounderstand the features of structure, ion migration and their correlation.These features essentially involve diffusion and relaxation. The coefficientsassociated with diffusion process, especially, the diffusion coefficient,diffusion length and relaxation time has been determined by applyingNguyen-Breitkopf method. Besides, by tuning the concentration of theconstituents, it is possible to obtain samples those exhibit two importantstructural characteristics; Fragility and Polymeric phase formation. Thepresent study essentially addresses these issues and endeavors to figure outthe corroboration among them. The relaxation behavior, when scrutinized in thelight of Diffusion Controlled Relaxation model, ascertains the fragilitythreshold which is also identified as the margin between the two types ofpolymeric phases. Simultaneously, it fathoms into the equivalent circuitry, itselements and their behavioral changes with above mentioned features. The powerlaw behavior of A.C. conductivity exhibits three different non-Jonscher typedispersive regimes along with a high frequency plateau. The sub-linearity andsuper-linearity remain significantly below and above the Jonscher's carriertransport limit, 0.5 < n < 0.9. Finally, by observing the behavior of thecrossover between these sub-linear and super-linear (SLPL) regime, an intuitivesuggestion has been proposed for the appearance of SLPL; oxygen vacancyformation at higher frequency.

Electrochemical Impedance spectroscopy study of AgI-Ag2O-MoO3 Glasses: Understanding the Diffusion, Relaxation, Fragility and Power Law Behavior