Abstract
Mixed former effect (MFE) and transport property studies on a new fast Ag+ ion conducting silver boro-molybdate glass system - 0.7[0.75AgI : 0.25AgCl] : 0.3[Ag2O : { xB2O3 : (1-x)MoO3} ] - are reported. A `quenched [0.75AgI : 0.25AgCl] mixed system/solid solution' has been used as the host salt in place of the traditional AgI host. The glass former compositions were varied from x = 0 to x = 0.9 in molar weight fraction, while the Ag+ ion salt concentration was kept constant. Thecomposition 0.7[0.75AgI : 0.25AgCl] : 0.3[Ag2O : { 0.7B2O3 : 0.3MoO3} ] exhibited highest conductivity (σ27°C = 6×10-3 S cm-1) at room temperature, and has been referred to as the optimum conducting composition (OCC). The conductivity enhancement in OCC, approximately 6 times from the pure molybdate glass system, has been found to be due to an increase in the Ag+ ion mobility. This has been attributed purely as a consequence of MFE. Temperature dependence on some important ion transport parameters such as conductivity (σ), mobility (µ), mobile ion concentration (n), ionic transference number (tion) and drift velocity (vd) were done for the OCC samples only, and energies involved in the different thermally activated processes were evaluated from the respective Arrhenius-type plots. The ion transport mechanism has been discussed in the light of models suggested for superionic glasses.
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