红外Ga_2S_3–Sb_2S_3硫系玻璃的热稳定性及光学性能

Optical Properties and Thermal Stability of Infrared Chalcogenide Glass Ga_2S_3–Sb_2S_3

采用真空熔融淬冷法制备GaxSb40-xS60硫系玻璃样品，并通过Archimedes法、x射线衍射、热膨胀系数分析、可见／近红外光谱吸收度与透过率、中远红外光谱透过率以及Raman散射光谱等研究了硫系玻璃样品的结构、热稳定性和光学性能。结果表明：随着Ga含量的增加，玻璃密度逐渐下降，玻璃转变温度逐渐提高，热膨胀系数不断减小，表明玻璃具有良好的热稳定性；玻璃的可见／近红外短波截止边均发生蓝移，光学带隙增大，而且保持了良好的红外透过率，其较宽的红外透过范围（0．8～14．0um），涵盖了目前3大主要通信波段和热红外波段，Ga-Sb-S玻璃已成为极具前景的红外材料。Ga含量增加促进[GaS4]四面体的形成，减少[SbS3]三角锥的比例，归纳了该类硫系玻璃的光学性质与结构的依赖关系。

Series of GaxSb40-xS60 chalcogenide glasses were synthesized by a melt-quenching method. The thermal and optical properties of sample glasses were determined by the Archimedes principle, X-ray diffraction, thermal expansion, ultra violet-visible-near infrared absorption spectroscopy, and Fourier transform infrared spectroscopy, respectively. The structures of the samples with different compositions were analyzed by Raman spectroscopy. The results show that all of the glasses have good thermal stability and spectral properties. The density decreases slightly, the glass transition temperature improves, and the thermal expansion coefficient reduces with increasing the content of gallium. Besides, there is a slightly augmentation of optic band gap and a regularly blue-shifted of IR absorption cutting-off edge. Since all of the chalcogenide glasses have a high transmittance in a wide spectrum range of 0.8-14.0 μm （covering three main commutation bands and thermal infrared band）, they are thus a promising material for mid-infrared application. According to the Raman spectra, the formation of [GaS4] tetrahedral units promote and the [SbS3] pyramid units suppress with the increase of gallium content. The relationship between optical properties and the structure in the chalcogenide glasses was summarized.