新型远红外Ge-Te-Se-Sn硫系玻璃的热学与光学性质研究

Reaserch on Thermal and Optical Properties of Novel Ge-Te-Se-Sn Far Infrared Transmitting Chalcogenide Glasses

采用熔融淬冷法制备了新型远红外Te基硫系玻璃Ge20-xTe65Se15Snx(x=0,2,4)。在Ge-Te-Se玻璃的基础上,通过引入重金属Sn,研究其对玻璃组成、结构和性能的影响。测试了样品的中红外热成像、X射线衍射(XRD)图谱、差热分析曲线(DSC)、可见/近红外吸收光谱、红外透射光谱。利用经典的Tauc方程计算了样品的光学带隙,根据金属标准和能量带隙理论讨论了玻璃光学带隙与组分变化的关系。分析结果表明,Ge-Te-Se-Sn玻璃具有良好的热稳定性,随着Sn的引入,玻璃的光学带隙减小,短波吸收截止边发生红移,但玻璃的红外截止波长基本不变。此外Sn可以有效减弱Ge-O杂质吸收峰的强度,提高玻璃红外透射性能。

A novel series of Ge2o-x Te65 Se55 Snx （ x = 0,2,4） chalcogenide glasses is prepared by traditional melt- quenching method. Infrared thermal （8-12μm） image, X-ray diffraction （XRD）, differential scanning calorimetry （DSC）, visible/near-infrared absorption spectroscopy and infrared transmission spectra are adopted to analyze the composition, structure and performance of the Ge-Te-Se glasses system with addition of Sn. The Tauc equation is used to calculate the direct and indirect optical band gap. Based on the metallization criterion and band gap energy theory, the relation between optical hand gap and composition is investigated. The results show that Ge-Te-Se-Sn glasses have good thermal stability. With the addition of Sn, the optical band gap of glass samples decreases, the short-wavelength edges shift to a longer wavelength, and the infrared cut-off wavelength almost keeps unchanged. Sn can weaken the intensity of the Ge-O absorption peak and improve the infrared transmission properties of glass samples.