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

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Abstract

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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Authors and Affiliations

  1. Unita del Consorzio INFM c/o Dipartimento di Matematica e Fisica, Universita di Camerino, I-62032, Camerino, Italy

    I. Davoli, E. Paris & S. Stizza

  2. Laboratori Nazionali di Frascati, C.P. 12, I-0044, Frascati, Italy

    M. Benfatto

  3. Dipartimento di Fisica, II Universita degli Studi di Roma Tor Vergata, I-00173, Roma, Italy

    M. Fanfoni

  4. TIB-Divisione Scienza del Materiali, ENEA, C.R.E.-Casaccia, I-00060, Casaccia-Roma, Italy

    A. Gargano

  5. Facolta di Medicina, Universita de L'Aquila, Via S. Sisto 20, I-67100, L'Aquila, Italy

    A. Bianconi

  6. Bayerisches Geoinstitut, W-8580, Bayreuth, Germany

    F. Seifert

Authors
  1. I. Davoli
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  2. E. Paris
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  3. S. Stizza
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  4. M. Benfatto
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  5. M. Fanfoni
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  6. A. Gargano
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  7. A. Bianconi
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  8. F. Seifert
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Davoli, I., Paris, E., Stizza, S. et al. Structure of densified vitreous silica: Silicon and oxygen XANES spectra and multiple scattering calculations. Phys Chem Minerals 19, 171–175 (1992). https://doi.org/10.1007/BF00202105

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  • DOI: https://doi.org/10.1007/BF00202105

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