Abstract

Silver ion conducting amorphous materials in the system Ag₂S–SiS₂ were synthesized over the composition range from 0 to 60 mol% Ag₂S by use of a high-energy ball-milling process. The electrical and electrochemical properties of the obtained samples were evaluated by using ac impedance spectra, dc polarization measurements, and cyclic voltammetry. These measurements suggested that the silver-ion conductivities of the samples increased with an increase in the Ag₂S content and that the activation energy for conduction decreased with an increase in the Ag₂S content. The 60Ag₂S·40SiS₂ (mol%) sample showed its highest ion conductivity, 6.9 × 10⁻² S m⁻¹, at 298 K in the system Ag₂S–SiS₂. This sample also possessed a wide electrochemical window over 2.0 V vs. Ag/Ag⁺.