Batchelor, S. and Oven, R. and Ashworth, D.G. (1998) The effect of field reversals on refractive index profiles and stress in electric field assisted K+-Na+ ion-exchanged soda-lime glass. Journal of Physics D-Applied Physics, 31 (4). pp. 390-401. ISSN 0022-3727.
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Soda-lime glass samples have been subjected to both single and double field reversals during electric field assisted K+-Na+ ion exchanges in the temperature range 350-450 degrees C. Changes in refractive index profiles, chemical profiles and surface stress were observed during the exchanges and a comparison has been made with previous studies. It is shown that large reductions in surface stress seen after single field reversals, which have previously been attributed primarily to a stress relaxation mechanism, are mainly caused by the removal of a large number of K+ ions. For example, at 395 degrees C K+ ion removal accounts for 80-95% of the stress reduction. It is shown that the drift-diffusion model of ion transport, using concentration-independent self-diffusion coefficients, cannot consistently model this large ion removal rate. A new model is developed which is based on drift-diffusion transport with concentration-dependent self-diffusion coefficients. The effects of double field reversals are also investigated. It is suggested that the glass may undergo an irreversible change associated with K+ ion removal.
|Subjects:||Q Science > QC Physics|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts|
|Depositing User:||I. Ghose|
|Date Deposited:||04 Apr 2009 10:33|
|Last Modified:||04 Apr 2009 10:33|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/17575 (The current URI for this page, for reference purposes)|
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