((GeSe_2)(SnSe_2)_(0.5))_(100-x)Te_x系统硫系玻璃的光学性能及结构

Optical Properties and Structure of ((GeSe_2)(SnSe_2)_(0.5))_(100-x)Te_x TexChalcogenide Glasses

硫系玻璃光纤具有优良的中远红外透过特性、抗酸性及良好的流变特性,在中远红外传感、高能激光传输、光谱学领域具有广泛的应用前景。采用熔融淬冷法制备了系列（（GeSe2）（SnSe2）0.5）100-xTex（x=0,20,40）硫系玻璃样品,测试了玻璃样品的X射线衍射谱、差示扫描量热曲线、可见/近红外光谱、Fourier红外光谱、显微Raman光谱,对玻璃的物化性能及结构进行表征。分析并讨论了在Ge-Se-Sn玻璃系统中随着Te的引入,玻璃样品的成玻能力及物化性能和光学特性的变化。利用经典的Tauc方程计算了样品的光学带隙的变化,解释并讨论了Raman光谱的变化与玻璃结构变化之间的关系。研究表明：Te的引入增加了玻璃结构的复杂度,使得基团及化学键之间的竞争激烈,提高了玻璃的成玻性能及稳定性;随着Te含量的增加,短波及长波截止边均发生红移,光学带隙减小,其中,玻璃组分样品（（GeSe2）（SnSe2）0.5）60Te40的稳定性最好,其特征温度（ΔT）为79℃,且具有良好的红外透过性能,其红外透过范围为1~17.50μm。

Chalcogenide glass fibers have wide application potential in mid-IR sensing, high power laser transfer and optical spectroscopy field for their good transmission properties in mid-far-infrared wavelengths, acid resistance and excellent rheologi- eal properties. A serious of （（GeSez） （SnSez）0, s ） 100-x Tex （x = 0, 20, 40） glass samples were prepared by melt-quenching meth- od. The physiochemical properties and structure changes of glasses were tested and characterized by teehniques of X-ray diffrac- tion, differential scanning calorimetry, visible-near IR spectrum, Fourier transform infrared spectrum, and Raman spectrosco- py. The changes of glass forming ability, physiochemical features and optical properties are discussed with the addition of Te in the Ge-Se-Sn system. The classical Tauc equation is used to calculate the direct and the indirect optical band gaps changes. The relationship between Raman spectroscopy changes and glass structures are explained and discussed. The results show that with the addition of Te, glass structure complexity increased result in the intense competition between the groups and chemical bonds and the glass forming ability and stability enhanced, Also, the red-shifting occurs in the short-wavelength and long- wavelength absorption cutting-off edge, the band gap decreases. The most stable glass sample is （（GeSe2） （SnSe2）0.s ）60Te40 with maximum AT value of 79 ℃ and good infrared transmittance with wide optical transmission window from 1 to 17. 50 μm.