Conductivity anomalies in tungstate-phosphate glasses: evidence for an ion-polaron interaction?

Conductivity anomalies are observed in mixed ion-polaron conducting glasses in the system Li 2O: WO 3: P 2O 5. Deep minima in conductivity (reminiscent of the mixed alkali effect) occur when small amounts of Li 2O are introduced into WO 3 − y : P 2 O 5 glasses. By contrast, glasses melted in air are...

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Bibliographic Details
Published in:Solid state ionics 1996-07, Vol.86, p.497-501
Main Authors: Bazan, J.C., Duffy, J.A., Ingram, M.D., Mallace, M.R.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Conductivities
Diffusion in solids
Electronic transport in condensed matter
Exact sciences and technology
Glasses
Mixed conductivity and conductivity transitions
Mobile cations
Physics
Polarons
Self-diffusion and ionic conduction in nonmetals
Transport properties of condensed matter (nonelectronic)
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Summary:Conductivity anomalies are observed in mixed ion-polaron conducting glasses in the system Li 2O: WO 3: P 2O 5. Deep minima in conductivity (reminiscent of the mixed alkali effect) occur when small amounts of Li 2O are introduced into WO 3 − y : P 2 O 5 glasses. By contrast, glasses melted in air are always deep blue in colour, except when large amounts of Li 2O are incorporated. It is suggested that negatively charged polarons (effectively the d-electron located on a W 5 + centre) interact strongly with mobile cations to form uncharged diffusing entities. This may be a general phenomenon in mixed ionic electronic conductors where mobilities of ions and electrons are comparable in magnitude.
ISSN:0167-2738
1872-7689
DOI:10.1016/0167-2738(96)82669-5