The optical, structural and thermal optimizations of Ge-As-Se-S-Te glasses

The optical, structural and thermal optimizations of Ge33As12Se55 glass were the aim of this study. In this regards, Ge33As12Se45M10 (M = Se, Te, S and S0.5Te0.5) glasses were synthesized by conventional melt quenching technique in quartz ampule. The prepared samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). The fundamental absorption edge for prepared samples was also analyzed in terms of the theory proposed by Davis and Mott. The addition of S and Te elements to melting batch has deleterious effects on optical properties of Ge33As12Se55 glass. Mg and Al can act as gettering elements for reduction of the intensity of oxide absorption bands from FTIR spectra (without any effects on optical properties of Ge33As12Se55 glass). The precipitation of GeSe phase, during crystallization process, has negligible effects on optical properties of Ge33As12Se55 glass.