The investigation of composition dependence of various properties of chalcogenide glasses has been increased in recent years. Since reversible switching phenomenon in certain types of chalcogenide glasses was first reported, a lot of attention has been given to characterization and improvement of the properties of chalcogenide glasses in general and the materials exhibiting the switching phenomenon in particular. In the present work, the effect on the physical properties with the variation in bismuth content has been studied theoretically for (Se80Ge20)100-xBix (x=4, 8, 12, 16, 20 at. %) glassy alloys. The glass transition temperature and mean bond energy are calculated by using the Tichy – Ticha approach. It has been found that almost all the parameters, studied here, were increased with the increase in Bi content, thus making this suitable for phase change optical recording and find applications in rewritable optical recording.
