Alkaline-Earth Diffusion in Mixed Cation Glasses

M. Grofmeier; F.V. Natrup; Hartmut Bracht

doi:10.4028/www.scientific.net/DDF.289-292.615

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 289-292Alkaline-Earth Diffusion in Mixed Cation Glasses

Alkaline-Earth Diffusion in Mixed Cation Glasses

Abstract:

Diffusion of alkaline-earth ions in mixed cation glasses of the composition xA2O•(3-x)MO•4SiO2 (x = 0.0, 0.1, 0.3, 0.4 and 1.0; A = Na, K; M = Ca, Ba) was investigated by means of the radiotracer diffusion technique below the respective glass transition temperatures. The mobility of alkaline-earth ions increases with the alkali content in all analyzed glass systems with no decrease in the diffusion activation energy, but a raise in the pre-exponential factor. A distinct dependency of the activation energy of the alkaline-earth ions on the type and content of the alkali ions in the glass is observed. Additional experiments with thin glass films derived by the sol-gel technique reveal an analogous diffusion behaviour. This demonstrates that the dynamic of alkaline-earth ions in mixed cation glasses does not depend on the way of glass preparation.