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Mixed Alkali Effect as a Retarding Effect of Secondary Diffusion Processes in Glass

Published online by Cambridge University Press:  10 February 2011

Vladimir Belostotsky
Vladimir Belostotsky*
Affiliation:
Fusion Lighting, Inc., Rockville, MD 20855, USA, vladbel@erols.com
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Abstract

Ion mobility in mixed alkali glass is discussed in the context of the recent experimental observation that oxygen diffusion from molten salt into glass accompanies the replacement of smaller alkali ions for larger alkali ions during ion exchange. The assumption is made that simultaneous migration of two unlike monovalent cations induces, among other things, oxygenexchange diffusion between sites. Diffusing oxygen molecules form additional fluctuating sites or traps lying along the ion pathways between regular ionic sites. Instead of jumping directly to the regular ionic site, mobile ions are forced to execute several additional hops between fluctuating sites, and this results in significant reduction in ion mobility.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 395
Copyright
Copyright © Materials Research Society 1999

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