大带隙Ge-S-I硫系玻璃制备及性能研究

Preparation and Properties of Large Gap Ge-S-I Chalcogenide Glass

为了探究碘元素对贫S基(GeS1.5)100-xIx和(GeS2)100-xIx(x=5,10,20,30,40)两个系列玻璃性质的影响,用快速真空和高温熔融淬冷技术制备了这两个系列的玻璃样品,对比测试了两组样品的密度、近红外吸收光谱、红外透过光谱、折射率、光学带隙和热膨胀,并在折射率数据的基础上计算了材料零色散波长.研究表明:随着碘含量的增高,近红外吸收截止波长发生明显的蓝移现象,玻璃转变温度和软化温度明显下降,玻璃的转变温度范围分别为222~330℃和236~332℃,软化温度范围分别为267~375℃和282~364℃,膨胀系数增大,红外透过性明显提高,光学带隙逐渐增大.通过扫描电子显微镜测定了玻璃组分的归一化质量比,并对比了抽真空时有无液氮冷却情况下玻璃原料中碘的含量损失差异,结果表明使用液氮冷却方法会增强玻璃中的杂质吸收峰.优化了玻璃制备工艺,采用高温聚合物做保护层对(GeS1.5)60I40玻璃进行了拉丝实验,测得其最低损耗为2.8dB/m.

In order to investigate the effects of iodine on the properties of two series of glasses with poor S-based （GeS.15）100-x Ix,and （GeS2）100-x Ix（x=5,10,20,30,40）, two series of glass samples were prepared by rapid vacuum and high temperature melt quenching. The density, near infrared absorption spectra, transmission spectra, refractive index, optical band gap and thermal expansion were measured and compared. Based on the measured refractive index data, the zero-dispersion point of the material was calculated. The results show that with the addition of iodine, the blue shift is observed in the near-infrared absorption cut-off wavelength, and the glass transition temperature and softening temperature decrease obviously. The transition temperature ranges of the two series are kept near 222~330℃ and 236 ~332℃, the soften temperature ranges from 267℃ to 375℃ and 282℃ to 364℃, respectively, the expansion coefficient, infrared transmittance and the optical band gap gradually increased. The actual composition of the glass was measured by scanning electron microscopy, and the loss of iodine in the glass raw material was compared with or without liquid nitrogen cooling in process of vacuuming, which shows that the impurity absorption peak intensity in the glass will be enhanced with liquid nitrogen cooling. The glass preparation and purification processes were optimized. Finally, the （GeS1.5）60 I40 glass covered by high temperature polymer was drawn and its loss was measured, which is 2.8 dB/m.