The ionic conductivity of (Ag, Na)-nitrite sodalites

M. R. M. Jiang, Mark T. Weller

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Ionic conductivity data for mixed Ag/Na-nitrite sodalites, AgNa(AlSiO)(NO), have been determined over the temperature range 250 to 550°C in ambient atmosphere using an ac impedance method. The activation energy for conduction is reported for five samples with silver contents ranging from x=0 to 7.5 and was found to be a monotonic function of silver content, with a minimum at the highest silver content. Conductivity isotherms for the mixed Ag/Na nitrite sodalites were constructed, showing a direct relationship of total ionic conductivity as a function of silver content, with fastest ionic motion at the highest silver content. A transition of conduction mechanism from Na ion predominance to Ag ion predominance with increasing x was confirmed from variations in the interfacial impedance characteristics. Ionic conductivity of nitrite sodalites is strongly dependent upon the ionic radius of the mobile cations incorporated.
Original languageEnglish
Pages (from-to)341-345
JournalSolid State Ionics
Issue number3-4
Publication statusPublished - 1991

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Copyright 2008 Elsevier B.V., All rights reserved.


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