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Proceedings Paper

IR-spectroscopical investigations on the glass structure of porous and sintered compacts of colloidal silica gels
Author(s): Rolf Clasen; M. Hornfeck; Wolfgang Theiss
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Paper 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.

Paper Details

Date Published: 1 August 1991
PDF: 12 pages
Proc. SPIE 1513, Glasses for Optoelectronics II, (1 August 1991); doi: 10.1117/12.46029
Show Author Affiliations
Rolf Clasen, Philips Research Labs. (Germany)
M. Hornfeck, Aachen Univ. of Technology (Germany)
Wolfgang Theiss, Aachen Univ. of Technology (Germany)


Published in SPIE Proceedings Vol. 1513:
Glasses for Optoelectronics II
Giancarlo C. Righini, Editor(s)

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