GeS_2-Ga_2S_3-CdS硫系玻璃的红外光谱研究

INFRARED SPECTRA STUDY OF GeS_2-Ga_2S_3-CdS CHALCOGENIDE GLASSES

采用熔融急冷法制备 GeS_2-Ga_2S_3-CdS 硫系玻璃,利用中、远红外光谱对玻璃结构进行深入探测和分析。玻璃的中红外光谱研究表明,玻璃中存在 S-S 同极键,且随 Ga_2S_3和 CdS 含量的增加而增强;玻璃样品的红外截止波长不随玻璃组成的变化而变化;若干杂质吸收峰都可以归结于玻璃制备过程中氧、氢和 H_2O 的污染以及玻璃表面的氧化。玻璃的远红外光谱研究表明,玻璃的基本结构单元是[GeS_(42)]和[GaS_(42)],存在 Ge(Ga)-(Ga)Ge 金属键,CdS 的加入导致玻璃中四面体结构单元的数目发生变化。

GeS2-Ga2S3-CdS chalcogenide glasses were prepared by conventional melt-quenching method and their structures were investigated by mid-and far-infrared spectroscopy. The mid infrared spectra results verified that S-S homopolar bond is present and its amount increases with the increasing of Ga2S3 and CdS. Infrared cut-off edge has no obvious change with compositional evolution and several absorption bands in spectra are ascribed to the oxygen, hydrogen, H2O contamination during the glass preparation and the surface oxidation of the raw elements. The far infrared spectra results indicated that the basic structural units forming the network are [GeS4/2] and [GAS4/2] tetrahedra and some Ge（Ga）-（Ga）Ge metallic bonds are also formed. The addition of CdS will result in the change of the amount of tetrahedra in glass net