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Fast diffusion path for water in silica glass

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Published/Copyright: February 26, 2019
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American Mineralogist
From the journal American Mineralogist Volume 104 Issue 3

Abstract

Diffusion experiments of 2H2O at 900–750 °C and water vapor pressure of 50 bar found diffusion of water in SiO2 glass more than one order of magnitude faster than that reported previously. The fast diffusion profile of water was observed as an extended tail of the normal water diffusion profile by a line scan analysis with SIMS, and it can be fitted with a diffusion model with a constant diffusivity. The obtained fast diffusion coefficient suggests that the diffusion species responsible for the fast diffusion is not molecular hydrogen but molecular water. The diffusivity and activation energy for the fast water diffusion can be explained by the correlation between diffusivities of noble gases in silica glass and their sizes. Because noble gases diffuse through free volume in the glass structure, we conclude that molecular water can also diffuse through the free volume. The abundance of free volume in the silica glass structure estimated previously is higher than that of 2H observed in the fast diffusion in this study, suggesting that the free volume was not fully occupied by 2H2O under the present experimental condition. This implies that the contribution of the fast water diffusion to the total water transport in volcanic glass becomes larger under higher water vapor pressure conditions.

Keywords: Water; silica glass; SIMS; diffusion pathway; free volume

Acknowledgments

This work was supported by the Ministry of Education, Sports, Science and Technology Kakenhi Grant. Constructive reviews from C.L. Losq and J. Amalberti are greatly appreciated.

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Received: 2018-08-30
Accepted: 2018-11-27
Published Online: 2019-02-26
Published in Print: 2019-03-26

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2019-6802
Keywords for this article
Water; silica glass; SIMS; diffusion pathway; free volume

Articles in the same Issue

  1. Letter
  2. Chessboard structures: Atom-scale imaging of homologs from the kobellite series
  3. Special collection: Microporous materials: Crystal-chemistry, properties, and utilizations
  4. Highlighting the capability of zeolites for agro-chemicals contaminants removal from aqueous matrix: Evidence of 2-ethyl-6-methylaniline adsorption on ZSM-12
  5. Special collection: Physics and chemistry of earth's deep mantle and core
  6. Origin and consequences of non-stoichiometry in iron carbide Fe7C3
  7. Special collection: Isotopes, minerals, and petrology: Honoring John Valley
  8. Application of mineral equilibria to estimate fugacities of H2O, H2, and O2 in mantle xenoliths from the southwestern U.S.A.
  9. Review
  10. Composition, paragenesis, and alteration of the chevkinite group of minerals
  11. Articles
  12. Spinel-anorthosites on the Moon: Impact melt origins suggested by enthalpy constraints
  13. Fast diffusion path for water in silica glass
  14. Micro- and nano-scale textural and compositional zonation in plagioclase at the Black Mountain porphyry Cu deposit: Implications for magmatic processes
  15. A XANES and EPMA study of Fe3+ in chlorite: Importance of oxychlorite and implications for cation site distribution and thermobarometry
  16. Sound velocities across calcite phase transitions by Brillouin scattering spectroscopy
  17. Trace element distributions in (Cu)-Pb-Sb sulfosalts from the Gutaishan Au-Sb deposit, South China: Implications for formation of high fineness native gold
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  19. Discovery of a zinc-rich mineral on the surface of lunar orange pyroclastic beads
  20. In-situ mapping of ferric iron variations in lunar glasses using X-ray absorption spectroscopy
  21. Book Review
  22. Book Review
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