Preparation and properties of Se-Te binary chalcogenide glass

Se-Te binary glass, as a fundamental component of chalcogenide glass, determines the properties of many glasses. However, there are few reports on this glass. In this study, the physical properties of Se_100-xTe_x glass were investigated by X-ray diffraction, Raman spectra, Infrared transmittance, UV visible spectra, DSC thermal, TMA thermal expansion and nanoindentation analyses. The result shows that the Se_100-xTe_x glass had high infrared transmittance (>54 %) in the range of 2–17.45 μm. The cut-off wavelength of Se_100-xTe_x glass at short-infrared and far-infrared are 850 nm and 20.68 μm, respectively. As Te content increases, the short-wave cutoff wavelength shifts towards the long-wave direction; the glass transition temperature T_g increases from 44.2 °C to 51.3 °C. The thermal expansion coefficient of the liquid α_L and the solid α_g decrease with Te content, which improve the dimensional stability of glass. Nanoindentation test shows that the hardness increases from 0.59 GPa to 1.02 GPa, while the elastic modulus increases from 11.9 GPa to 16.1GPa with Te content.