Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2015 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : S1-05
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S1: Igneous processes and fluids
Concentration dependence of water diffusion in silicate glasses
*Minami KuordaShogo TachibanaSatoshi OkumuraMichihiko NakamuraNaoya SakamotoHisayoshi Yurimoto
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Abstract

Diffusion experiments of water in SiO2 glass were made to understand the concentration dependence of water diffusion and its mechanism. We propose that water diffusivity in SiO2 glass is controlled by the relative abundance of main diffusion species (molecular water) and numbers of diffusion pathways, which are produced by hydroxyls. Our model is applicable to water diffusion in silicate glasses by considering the effects of concentration of network modifier cations and the water concentration dependence of activation energy.

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© 2015 Japan Association of Mineralogical Sciences
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