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Structural characterization and compositional dependence of the optical properties of Ge-Ga-La-S chalcohalide glass system

机译:Ge-Ga-La-S卤化卤化物玻璃体系的光学特性的结构表征和成分依赖性

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In this paper, chalcogenide glasses of 80GeS(2)-(20-x)Ga2S3-xLa(2)S(3) (x = 0, 1, 3, 5 mol%) were synthesized through the traditional melt-quenching technique. The effects of La2S3 addition on the thermal, optical, and structural properties of Ge-Ga-S glasses were investigated. Results showed that the synthesized glasses possessed considerably high glass transition temperature, improved glass forming ability, high refractive index, and excellent infrared transmittance. A redshift at the visible absorbing cut-off edge lower than 500 nm was observed with increasing of La2S3 content. Direct and indirect optical band gap values were calculated. SEM result suggested that this glass system owned better glass forming ability and uniformity. Raman spectral analysis indicated that the introduction of La2S3 induced the dissociation of Ge-Ge metal bonds and transformed the [S3Ge-GeS3] structure to GeS4 tetrahedrons. Consequently, the connectivity between tetrahedrons of the vitreous network was enhanced. This work suggests that La2S3 modified Ge-Ga-La-S glass is a promising material for infrared optical research. (C) 2018 Elsevier B.V. All rights reserved.
机译:在本文中,通过传统的熔体淬火技术合成了80GeS(2)-(20-x)Ga2S3-xLa(2)S(3)(x = 0、1、3、5 mol%)的硫属化物玻璃。研究了添加La2S3对Ge-Ga-S玻璃的热,光学和结构性能的影响。结果表明,合成玻璃具有相当高的玻璃化转变温度,提高的玻璃形成能力,高的折射率和优异的红外透射率。随着La2S3含量的增加,可见吸收截止边缘的红移低于500 nm。计算直接和间接光学带隙值。 SEM结果表明该玻璃体系具有较好的玻璃成型能力和均匀性。拉曼光谱分析表明,La2S3的引入引起Ge-Ge金属键的解离,并使[S3Ge-GeS3]结构转变为GeS4四面体。因此,增强了玻璃体网络的四面体之间的连通性。这项工作表明,La2S3改性的Ge-Ga-La-S玻璃是用于红外光学研究的有前途的材料。 (C)2018 Elsevier B.V.保留所有权利。

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