Electrical conduction in glass fibres subjected to a sodium to or from silver ion-exchange treatment

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Abstract
Both DC and AC resistivities of some silicate glass fibres containing 10 to 30 mol.% sodium and subjected to a sodium to or from silver ion-exchange treatment have been investigated. Ion-exchanged fibres exhibit resistivity and activation energy values lower than those of the untreated ones. A suitable combination of temperature and electric field brings about a further semi-permanent reduction in resistivity and activation energy values. Typical values of room temperature resistivity and activation energy in this high conducting state are approximately 50 Omega cm and 0.04 eV respectively. Such behaviour is explained on the basis of formation of an interconnected silver-rich phase under the combined influence of temperature and a suitable electric field. The properties exhibited by these materials are comparable to some of the conventional fast ion conducting glasses containing a higher silver concentration than those in the present system.

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