Effect of Bound Water on the Fractal Geometry of Nanosized Cracks in Glasses Prepared by Vacuum Pressure-Assisted Sintering.

Autor: Chmel', A., Petrovskii, G., Semenov, A., Smirnov, A., Shashkin, V.
Zdroj: Glass Physics & Chemistry; Sep2001, Vol. 27 Issue 5, p460-463, 4p
Abstrakt: The vibrational properties of fractal nanocracks in vitreous SiO2samples prepared by vacuum pressure-assisted sintering are investigated by low-frequency Raman scattering spectroscopy. In the Raman spectrum, nanosized discontinuities with a fractal geometry manifest themselves in a specific frequency dependence of the scattering intensity: a monotonic decrease in the intensity according to the law of light scattering by acoustic vibrations localized on fractals is observed instead of the boson peak. The frequency dependence of the low-frequency Raman scattering intensity is analyzed for samples of different origins. A “smoothing” of the nanocrack profile with a decrease in the amount of bound water in the material is revealed. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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