Density and viscosity of 0.25[xKSCN + (1 − x)NaSCN] + 0.75CH3CONH2 melt systems were measured as functions of temperature (293.15 ≤ T/K ≤ 343.15) and mole fraction, x = 0.0 to 1.0. The temperature dependence of viscosity has been analyzed by using the Vogel−Tammann−Fulcher (VTF) equation. Molar volumes and intrinsic volume were found to be additive in nature. The existence of the mixed alkali effect (MAE) has been established by the significant negative deviation from the additivity in the ideal glass transition temperature and in the viscosity isotherms. The onset of the MAE in the present system has been explained by the mutual contribution of the polarization effect of SCN- ion on the Na+ ion and the presence of the rigid polymeric type structure, which decrease as the Na+ ions are progressively replaced by the K+ ions.

Densities, electrical conductivities, viscosities, and sound velocities of 0.22[xLiBr + (1x)LiNO 3 ] + 0.78CH 3 CONH 2 were measured as functions of temperature (296.75 e T/K e 343.15) and composition (x ) 0.0-1.0 mole fraction). Electrical conductivity, viscosity, and structural relaxation time were found to have non-Arrhenius temperature dependence and were analyzed by using the Vogel-Tamman-Fulcher equation. A significant mixed anion effect has been found in the electrical conductivity isotherms. Viscosity and structural relaxation time vary linearly with composition. The variation of electrical conductivity is governed by the mobility of Brand NO 3ions and the competitive polarization exerted by anions on Li + , whereas the polymeric and rigid structure formed between Li + and acetamide primarily govern the viscosity process.