Nanostructure of glasses: experimental evidence

L. Maksimov, A. Anan’ev, V. Bogdanov, A. Lipovskii, D. Tagantsev, O. Yanush
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引用次数: 1

Abstract

Inorganic glass is material having nanoscaled physical and chemical inhomogeneities ad initio because glass inherits thermodynamic fluctuations of concentration, density and anisotropy of a glass forming melt. Combining light scattering and high temperature acoustics data allows to use the effect of internal immersion for designing multicomponent glasses with Rayleigh scattering losses lower than those of the silica glass. Non-random spatial distribution of dopants including rare-earth (RE) ions in a glass host (doped ion segregation) causes excessive Rayleigh scattering losses and enhancement of RE ion-ion interaction. Therefore, it opens the way to optimize operation parameters of laser and up-converting glasses by the proper choice of glass host composition. Results of Raman scattering spectra processing and characterization of electrooptical (EO) sensitivity of niobate glasses showed the existence of groups with stoichiometry of the well-known EO crystals and crystal-like orderliness (crystal motifs) in the glasses as the necessary condition of high EO sensitivity. It was found that EO sensitivity of glasses could be essentially increased by thermal treatment.
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玻璃纳米结构:实验证据
无机玻璃是一种从一开始就具有纳米级物理和化学非均质性的材料,因为它继承了玻璃成型熔体的浓度、密度和各向异性的热力学波动。结合光散射和高温声学数据,可以利用内部浸没效应来设计瑞利散射损失低于硅玻璃的多组分玻璃。含稀土离子的掺杂剂在玻璃基体中的非随机空间分布(掺杂离子偏析)导致了过量的瑞利散射损失和稀土离子相互作用的增强。因此,通过合理选择玻璃主体成分,为优化激光器和上转换玻璃的操作参数开辟了道路。对铌酸盐玻璃的拉曼散射光谱处理和电光灵敏度表征结果表明,玻璃中存在具有化学计量学意义的基团和晶体有序结构(晶体基序)是高光电灵敏度的必要条件。结果表明,热处理能显著提高玻璃的EO灵敏度。
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