Highly Ag+ conductive glasses in the system AgI-Ag2O-B2O3 were prepared by mechanochemical synthesis using a high energy planetary ball mill apparatus. The glass forming region for the composition series of xAgI.(100-x)(0.5Ag2O.0.5B2O3)(mol%) was determined. The mechanically milled sample with 60mol% AgI exhibited the highest conductivity of 1.7x10-2 S cm-1 at room temperature, which is comparable to the conductivity of the corresponding melt quenched glass. The glass transition temperature (Tg) of the milled sample was lower than that of the corresponding melt quenched glasses, but the Tg approached the Tg of the quenched glass with increasing milling time. The local structure, in particular the fraction of four- coordinated BO4 units, closely related to electrical & thermal properties of the AgI-based borate glasses.
