Diffusion of water in rhyolitic glasses

Details Diffusion of water in rhyolitic glasses Diffusion of water in rhyolitic glasses

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55..441z&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, Feb. 1991, p. 441-456.

Computer Science

36

Activation Energy, Diffusion Coefficient, Glass, Moisture Content, Rhyolite, Chemical Composition, Concentration (Composition), Hydroxyl Radicals, Ion Density (Concentration), Rare Gases

Scientific paper

The process of water diffusion in 11 natural rhyolitic glasses was considered using the results of measurements by FTIR spectroscopy of concentration profiles of both H2O and OH at different temperatures. The diffusion coefficients of H2O and OH, D(H2O) and D(OH), respectively, were calculated from concentration profiles. Results indicate that, at 400-530 C, the value of D(OH) is negligible compared to that of D(H2O), and that OH does not contribute significantly to the diffusion of total water even at water concentrations as low as 0.2 percent, which is minute compared to that of OH. In the activation energy vs radius plot, the D(H2O) followed the same trend as that of noble gases.

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