Determination of oscillator force and electronic polarizability in Fe-Sb-S-I glasses based on refractive index measurements

Abstract

The oscillator force and resonant frequencies were determined for chalcogenide glasses of Fex[(Sb2S3) 0.75(Sbl3)0.25]100-x system, for x=0, 0.1, 0.5, 0.8 and 1 at % of Fe. It is noticed that resonant frequency are practically independent on iron content in investigated glasses (ωo=9.071014 Hz). The Sellmeir dispersion formula was used to describe the dispersion characteristics of the medium. We established analytic form of the oscillator force in terms of iron content. The electronic polarizability was also determined by using Lorentz-Lorentz relation. At given wavelength of incident light the electronic polarizability decrease with increasing the density of glasses. These materials posses positive values of Grüneisen constant.