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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Vibrational spectroscopy study of niobium germanosilicate glasses
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Vibrational spectroscopy study of niobium germanosilicate glasses

机译：铌酸锗硅玻璃的振动光谱研究

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摘要

A series of glasses in the (Ge,Si)O2–Nb2O5–(Na,K)2O system were prepared by melting and casting. Their density and characteristic temperatures were determined by Differential Thermal Analysis (DTA) and their structure was analyzed by infrared and polarized Raman spectroscopies. DTA data have indicated an increased glass thermal stability with the replacement of GeO2 by SiO2. Kramers–Kronig analysis of the infrared specular reflectance data indicated a strong ionic character for the germanosilicate glasses. The Raman spectra of germanosilicate compositions were generally dominated by an intense Boson peak at 72 cm-1 and a high frequency, polarised peak at 880 cm-1, related to NbO6 octahedra with at least one non-bridging oxygen. The germanosilicate structure appears to be formed by alternating GeO4 tetrahedra and NbO6 octahedra, in addition to SiO4 tetrahedra.
机译：通过熔化和铸造制备了一系列在（Ge，Si）O2–Nb2O5–（Na，K）2O系统中的玻璃。通过差示热分析（DTA）确定其密度和特征温度，并通过红外和偏振拉曼光谱分析其结构。 DTA数据表明，用SiO2代替GeO2可以提高玻璃的热稳定性。 Kramers-Kronig对红外镜面反射数据的分析表明，锗硅酸盐玻璃具有很强的离子特性。锗硅酸盐组合物的拉曼光谱通常由在72 cm-1处的强玻色子峰和在880 cm-1处的高频极化峰所支配，这与NbO6八面体有关，具有至少一种非桥接氧。除了SiO4四面体之外，锗硅酸盐结构似乎是由交替的GeO4四面体和NbO6八面体形成的。

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