Effect of Te proportion on the properties of Ge25Sb10Se65-xTex chalcogenide glasses

Abstract

The effect of Te proportion on the physical, thermal and optical properties of GeSbSe glasses was the goal of this study. In this regards, four different glasses of Ge25Sb10Se65-xTex (5⩽x⩽20) were prepared by conventional melt quenching technique in quartz ampoule. The produced samples were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR spectroscopy), Vickers hardness tester, Differential scanning calorimetry (DSC) and Thermal mechanical analysis (TMA). Based on the obtained results, we known that the overall transmittance of the samples is about 55%. For physical properties, as the Te content increases from 5% to 20%, the glass density increases from 4.52 g cm−3 to 4.78 g cm−3 and the Vickers hardness value is improved from 172 kg mm−2 to 198 kg mm−2. With respect to the thermal properties, the glass transition temperature is 551.45–514.56 K and the difference of Tx − Tg is more than 110 K, where Tx is the initial crystallization temperature, and Tg is the glass transition temperature. While the thermal expansion coefficient varies little, from 1.87×10-5 to 1.82×10-5. In addition, the Tg value achieved by DSC is higher than that of TMA, which gives out a reference for the measurement of characteristic temperature.