Abstract
The dependence of the refractive index upon temperature in ZnSe1-xSx has been investigated using a pseudopotential approach. Our findings are in very good accord with the available experimental and previous theoretical data. The composition dependence of the refractive index is found to be non-monotonous exhibiting a non-zero refractive index bowing parameters. The refractive index is shown to vary continuously and monotonically with raising temperature for each composition x. The temperature linear coefficient values of the refractive index have been reported and their dependence on S content has been examined. Besides, the refractive index bowing parameter and its dependence on temperature are presented and discussed.