Structure and ionic conductivity of new Ga2S3-Sb2S3-NaI chalcogenide glass system.

A new glass system of (100- x) (0.2Ga 2 S 3 -0.8Sb 2 S 3)- x NaI (x = 5–30 mol%) was investigated through a melt-quenching method for solid-state electrolyte application. Na+ was added into the glass matrix as a conductive ion to study its effect on the properties of glass samples. XRD result indicated that the glasses retained their amorphous state until the NaI content exceeded 30 mol%. With increased NaI component, the density and hardness of glasses slightly decreased. DSC measurement showed that the glass-transition temperature of samples decreased, whereas the glass thermal stability improved. We speculated that the incorporation of NaI may have caused the destruction of [S 3 Ga–GaS 3 ] ethane-like units and formation of [GaS 4−x I x ] structure, thereby decreasing the connectivity of the glass network. The conductivity of glass samples was further determined using the AC impedance method. • Infrared chalcogenide glass system of Ga2S3-Sb2S3–xNaI are fabricated successfully. • Modification of NaI in glass samples is beneficial to the thermal properties. • The structure of glass network are compared about adding NaI and AgI. [ABSTRACT FROM AUTHOR]