Investigations were made of the electrical and electrochemical properties of a new silver tungstate glass system, x[0.75AgI:0.25AgCl]:(1−x)[Ag2O:WO3], where 0.1 ≤ x ≤ 1 (molar weight fraction). A so-called quenched [0.75AgI:0.25AgCl] mixed system/solid solution was used as a host salt in place of the usual host AgI for synthesizing the glass system. Compositional variation of room temperature conductivity of the glass systems prepared identically using both the new and traditional hosts exhibited conductivity maxima at x = 0.7. The composition, 0.7[0.75AgI: 0.25AgCl]:0.3[Ag2O: WO3], exhibited the highest room-temperature conductivity (σ27C = 4.0 x 10−3S/cm) and was referred to as the optimum conducting composition. Formation of glass in the optimum conducting composition was confirmed by X-ray diffraction and differential thermal analysis. A direct determination of ionic mobility (μ), was done by transient ionic current technique, subsequently, mobile ion concentration (n) was evaluated by using σ and μ data. An increase in μ was ascribed as the reason for the enhancement in the room temperature conductivity as compared to pure host. Temperature dependence of ionic parameters, namely, σ, μ, n, ionic transference number (tion) and ionic drift velocity (vd) was carried out on the optimum conducting composition sample only and the mechanism of ion transport was explained in the light of models suggested for superionic glasses. The electrochemical study on solid state batteries, fabricated by using the optimum conducting composition as an electrolyte with Ag-metal as anode and C+I2 as cathode, exhibited a satisfactory performance during low current drain.
Electrical and Electrochemical Properties of a New Silver Tungstate Glass System, x[0.75AgI:0.25AgCl]:(1−x)[Ag2O:WO3]. R.C.Agrawal, M.L.Verma, R.K.Gupta: Solid State Ionics, 2004, 171[3-4], 199-205