Alkaline-Earth Diffusion in Mixed Cation Glasses

Abstract:

Article Preview

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.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 289-292)

Edited by:

A. Agüero, J.M. Albella, M.P. Hierro, J. Phillibert and F.J. Pérez Trujillo

Pages:

615-620

DOI:

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

Citation:

M. Grofmeier et al., "Alkaline-Earth Diffusion in Mixed Cation Glasses", Defect and Diffusion Forum, Vols. 289-292, pp. 615-620, 2009

Online since:

April 2009

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.