The decrease of the mean Si-O-Si angle in vitreous silica upon densification from 2.20 to 2.36 gcm-3has been followed by oxygen and silicon K-edge XANES spectroscopy. Multiple scattering calculations using clusters of two shells around the oxygen and silicon atoms, respectively, are in good agreement with experimental absorption spectra and confirm mean Si-O-Si angles between 130 and 144° for these samples, and a decrease of the mean angle with densification. The experimental spectra also exhibit features due to scattering at outer (>2) shells around the photoabsorbers. © 1992 Springer-Verlag.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Geochemistry and Petrology
Davoli, I., Paris, E., Stizza, S., Benfatto, M., Fanfoni, M., Gargano, A., Bianconi, A., & Seifert, F. (1992). Structure of densified vitreous silica: Silicon and oxygen XANES spectra and multiple scattering calculations. Physics and Chemistry of Minerals, 19(3), 171 - 175. https://doi.org/10.1007/BF00202105