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Title: Local Structures around Si, Al and Na in Hydrated Silicate Glasses

Abstract

XANES spectra were collected at the Si-, Al-, and Na K-edge in hydrous silicate glasses to understand the effect of water on the local structure around these cations. Around network forming Si and Al, no drastic changes are observed. Around Na, the dissolution of water creates more ordered environments in Al-bearing glasses and less ordered environment in Al-free glasses. Ab-initio XANES calculations were undertaken to understand the structural origins for these features. Based on these results, a bond valence model was refined that considers not only the present XANES experiments and models but also NMR information. The double percolation model refined explains, among others, the explosive properties of water-bearing hydrous melts, at the origin of a number of cataclysmic eruptions in subduction zones.

Authors:
 [1];  [2]; ;  [3];  [3];  [4];  [5]; ;  [6];  [7]
  1. USM 201 'Mineralogie-Petrologie', Museum National d'Histoire Naturelle, CNRS UMR 7160, Paris (France)
  2. (United States)
  3. Laboratoire des Geomateriaux, Universite de Marne la Vallee, Marne la Vallee (France)
  4. (France)
  5. Institut fuer Geowissenschaften, Universitaet Potsdam (Germany)
  6. CNRS-UR1 SOLEIL, Gif sur Yvette, (France)
  7. (Switzerland)
Publication Date:
OSTI Identifier:
21054598
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 882; Journal Issue: 1; Conference: XAFS13: 13. international conference on X-ray absorption fine structure, Stanford, CA (United States), 9-14 Jul 2006; Other Information: DOI: 10.1063/1.2644478; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; ALUMINIUM; CATIONS; CHEMICAL BONDS; DISSOLUTION; GLASS; NUCLEAR MAGNETIC RESONANCE; SILICATES; SILICON; SODIUM; SOLVATION; SUBDUCTION ZONES; VALENCE; WATER; X-RAY SPECTROSCOPY

Citation Formats

Farges, Francois, Department of Geological and Environmental Sciences, Stanford University, Stanford, Wispelaere, Sidoine de, Rossano, Stephanie, Munos, Manuel, Laboratoire de Geologie des Chaines Alpines, Universite de Grenoble I, Grenoble, Wilke, Max, Flank, Anne-Marie, Lagarde, Pierre, and Swiss Light Source, Villigen. Local Structures around Si, Al and Na in Hydrated Silicate Glasses. United States: N. p., 2007. Web. doi:10.1063/1.2644478.
Farges, Francois, Department of Geological and Environmental Sciences, Stanford University, Stanford, Wispelaere, Sidoine de, Rossano, Stephanie, Munos, Manuel, Laboratoire de Geologie des Chaines Alpines, Universite de Grenoble I, Grenoble, Wilke, Max, Flank, Anne-Marie, Lagarde, Pierre, & Swiss Light Source, Villigen. Local Structures around Si, Al and Na in Hydrated Silicate Glasses. United States. doi:10.1063/1.2644478.
Farges, Francois, Department of Geological and Environmental Sciences, Stanford University, Stanford, Wispelaere, Sidoine de, Rossano, Stephanie, Munos, Manuel, Laboratoire de Geologie des Chaines Alpines, Universite de Grenoble I, Grenoble, Wilke, Max, Flank, Anne-Marie, Lagarde, Pierre, and Swiss Light Source, Villigen. Fri . "Local Structures around Si, Al and Na in Hydrated Silicate Glasses". United States. doi:10.1063/1.2644478.
@article{osti_21054598,
title = {Local Structures around Si, Al and Na in Hydrated Silicate Glasses},
author = {Farges, Francois and Department of Geological and Environmental Sciences, Stanford University, Stanford and Wispelaere, Sidoine de and Rossano, Stephanie and Munos, Manuel and Laboratoire de Geologie des Chaines Alpines, Universite de Grenoble I, Grenoble and Wilke, Max and Flank, Anne-Marie and Lagarde, Pierre and Swiss Light Source, Villigen},
abstractNote = {XANES spectra were collected at the Si-, Al-, and Na K-edge in hydrous silicate glasses to understand the effect of water on the local structure around these cations. Around network forming Si and Al, no drastic changes are observed. Around Na, the dissolution of water creates more ordered environments in Al-bearing glasses and less ordered environment in Al-free glasses. Ab-initio XANES calculations were undertaken to understand the structural origins for these features. Based on these results, a bond valence model was refined that considers not only the present XANES experiments and models but also NMR information. The double percolation model refined explains, among others, the explosive properties of water-bearing hydrous melts, at the origin of a number of cataclysmic eruptions in subduction zones.},
doi = {10.1063/1.2644478},
journal = {AIP Conference Proceedings},
number = 1,
volume = 882,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}