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The Mixed Alkali Effect in Sodium Rubidium Germanate Glasses

Published online by Cambridge University Press:  25 February 2011

J. N. Mundy
Affiliation:
Materials Science and Technology Division Argonne National Laboratory, Argonne, IL 60439
G.-L. Jin
Affiliation:
Materials Science and Technology Division Argonne National Laboratory, Argonne, IL 60439
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Abstract

The lack of general applicability of the many theoretical models for the mixed alkali effect (MAE) in glasses is briefly reviewed. Although the MAE appears to be related to the bonding affinity of alkali ions to charge compensating centers in the glass network, experimental scatter and the difficulty of comparing different glass networks have prevented systematic tests of this relationship. The present paper discusses why the mixed alkali germanate glasses should provide a glass system where the concentration and strength of charge-compensating centers can be systematically varied and the relationship to the MAE tested. Such tests are only possible if the ionic conductivity of a series of mixed alkali germanate glasses can be measured in a reproducible manner. The measurements of the ionic conductivity of two series of X(Na,Rb)2O:(1-X)GeO2 glasses, with X = 0.19 and X = 0.29, respectively, suggest the necessary reproducibility can be attained.

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Articles
Copyright
Copyright © Materials Research Society 1986

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