Structural, thermal and electrical properties of AgI–Ag 2S–AgPO 3 superionic glasses

Abstract

We have investigated the ternary glass AgI–Ag 2S–AgPO 3, where the ratio of AgI:Ag 2S is 1:1. As the amount of the dopant salts increases, the glass transition temperature decreases, and the conductivity increases to about 5.7×10 −3 (Ω cm) −1 at room temperature for an 88% mol fraction of AgI+Ag 2S. The structure factor, S( Q), shows a prepeak at low Q values (0.6–0.9 Å −1), as observed in AgI–AgPO 3 glasses, but not in pure AgPO 3 or in Ag 2S–AgPO 3. The concentration dependence of the prepeak indicates medium range atomic correlations growing in concentration and size.