IR-spectroscopical investigations on the glass structure of porous and sintered compacts of colloidal silica gels

Rolf Clasen; M. Hornfeck; Wolfgang Theiss

doi:10.1117/12.46029

1 August 1991 IR-spectroscopical investigations on the glass structure of porous and sintered compacts of colloidal silica gels

Rolf Clasen, M. Hornfeck, Wolfgang Theiss

Author Affiliations +

Proceedings Volume 1513, Glasses for Optoelectronics II; (1991) https://doi.org/10.1117/12.46029
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

Abstract

The forming and sintering of fumed silica powders is an interesting route for the preparation of large, very pure or doped silica glasses with a precise geometry. The processing from the shaping of a porous compact to the sintering of transparent silica glass can be successfully investigated with optical spectroscopy. As only the dielectric function DF (a dielectric function is the square root of the complex refractive index) characterizes the material, the vibrational bands were calculated from reflectance measurements. In compacts of fine particles, the topology cannot be neglected. Therefore, the models describing topological effects are briefly reviewed. With these model calculations it could be proven that new bands in the compacts and the significant shifts in the reflectance spectra during sintering are mainly caused by topological effects and that changes in the glass structure play only a secondary role.

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Rolf Clasen, M. Hornfeck, and Wolfgang Theiss "IR-spectroscopical investigations on the glass structure of porous and sintered compacts of colloidal silica gels", Proc. SPIE 1513, Glasses for Optoelectronics II, (1 August 1991); https://doi.org/10.1117/12.46029

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