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Structure of densified vitreous silica: Silicon and oxygen XANES spectra and multiple scattering calculations

✍ Scribed by I. Davoli; E. Paris; S. Stizza; M. Benfatto; M. Fanfoni; A. Gargano; A. Bianconi; F. Seifert

Book ID: 104661491
Publisher: Springer-Verlag
Year: 1992
Tongue: English
Weight: 549 KB
Volume: 19
Category: Article
ISSN: 0342-1791
DOI: 10.1007/bf00202105

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✦ Synopsis

The decrease of the mean Si-O-Si angle in vitreous silica upon densification from 2.20 to 2.36 gcm -3 has 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.

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