Radiation-enhanced diffusion of Na in alkaline glasses |
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| Affiliation: | 1. National Research Centre “Kurchatov Institute”, 123182 Moscow, Russian Federation;2. Shubnikov Institute of Crystallography of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russian Federation;3. St. Petersburg State University, 199034 St. Petersburg, Russian Federation |
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| Abstract: | ![]()
The surface Na concentration of glass is found to increase under X-ray flux. The experimental data are well fitted by a first-order rate equation and are interpreted on the basis of radiation-enhanced diffusion mechanism of the Na with a coupling between material and defect fluxes.The Na concentration-versus-depth profiles show that the phenomenon also takes place at depth greater than the XPS sampling depth. Moreover, there is some evidence that in addition to diffusion from the bulk, surface segragation also occurs. |
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