摘要:
认识玻璃组成-性能-结构之间关系是玻璃科学中经久不衰的研究课题之一。在制得(100?x) GeS2-xIn2S3(x =10,15,20,25或30 mol%)系列玻璃和玻璃陶瓷样品的基础上,利用可见-近红外透过光谱, DSC, XRD和Raman光谱等测试技术表征了随组份变化的光学带隙,玻璃转变温度以及晶化行为等,并结合GeS2-Ga2 S3玻璃研究结果探讨了Ga, In 元素及其形成的网络结构对玻璃性质的影响。研究发现,在硫系玻璃中In比Ga对光学带隙和玻璃转变温度等性质的影响要大。它们所形成玻璃的晶化行为也截然不同,但与其各自的材料相图有着密切的联系。利用偏振拉曼光谱获得玻璃网络中的基本结构单元信息。最后,结合材料相图,玻璃随组成变化的物化性质和晶化行为以及基本网络结构单元的认识,探讨了玻璃的化学拓扑与网络拓扑之间的联系,为今后研究提供一种新的研究思路。
Abstract:
Relationship among the composition, properties, and structure of glasses are one of the long standing topics in glass science. In this paper, (100?x) GeS2-xIn2S3 (x=10, 15, 20, 25 or 30 mol%) glasses and glass-ceramics are prepared by melt-quenching and subsequent heat treatments. Their composition dependence of optical bandgap, glass transition temperature, and crystallization behavior is measured by various techniques, and the effect of Ga or In element and the related structural units on their properties is discussed with the help of the previous researches on the GeS2-Ga2S3 glass system. Results show that In has a much bigger influence than Ga on the optical bandgap and glass transition temperature of chalcogenide glasses, while the crystallization behavior of the two kinds of glasses containing Ga and In is totally different, but has a close connection with the respective phase diagram. Their structural motifs can be realized by employing polarized Raman spectra. Consequently, combined with the recognition of their phase diagrams, the composition dependence of physiochemical properties and crystallization behavior, as well as the structural motifs, the correlation between chemical and structural topology is briefly discussed, which may provide a new insight into the glass topological structure.
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