Abstract
This work reports the effect of GeTe content on properties of a chalcohalide glassy system ((As
2
Se
3
)
0.6
(AgI)
0.4
)
100
−x
(GeTe)
x
(
x
= 0, 15, 55 and 70 at.%). The study was based on the model of chemical bond approach. The results showed that the molar volume increased, whereas the packing density decreased, with increasing the GeTe concentration in an As–Se–Ag–I–Ge–Te matrix. The average coordination number, number of constraints and cross-linking density increased while the floppy modes and lone pair electrons were decreased. The cohesive energy, average heat of atomisation and mean bond energy also increased. A linear relationship was found between the cohesive energy to the heat of atomisation of the studied glassy system. In addition, we present two different estimations of the band gap energy. The positions of conduction and valence bands positions were determined. The gap varied between 1.098 and 1.197 eV; thus, all compositions can be useful for IR applications.