The effect of field reversals on refractive index profiles and stress in electric field assisted K+-Na+ ion-exchanged soda-lime glass

Batchelor, S. and Oven, Robert 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. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1088/0022-3727/31/4/008

Abstract

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.

Item Type: Article
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: 03 Jun 2014 09:44
Resource URI: http://kar.kent.ac.uk/id/eprint/17575 (The current URI for this page, for reference purposes)
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