Mixed former effect in sodium phospho tellurate glasses

Glasses in the binary system xNa 2 P 2 O 6-( l − x) Na 2 Te 2 O 5 have been synthesised for 0≤ x ≤1. For all compositions, the glasses are transparent and appear homogeneous. Nevertheless for compositions near x = 0.4 glasses seem to be heterogeneous on SEM observations. Glass transition temperature...

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Bibliographic Details
Published in:Solid state ionics 1996, Vol.86, p.447-451
Main Authors: Jayasinghe, G.D.L.K., Bandaranayake, P.W.S.K., Souquet, J.L.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Conductivity
Diffusion in solids
Exact sciences and technology
Glass transition temperature
Glasses
Network
Physics
Self-diffusion and ionic conduction in nonmetals
Transport properties of condensed matter (nonelectronic)
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Summary:Glasses in the binary system xNa 2 P 2 O 6-( l − x) Na 2 Te 2 O 5 have been synthesised for 0≤ x ≤1. For all compositions, the glasses are transparent and appear homogeneous. Nevertheless for compositions near x = 0.4 glasses seem to be heterogeneous on SEM observations. Glass transition temperatures for all the compositions are between 220 and 310 °C. Conductivity data have been obtained using impedance techniques in the 100–250 °C temperature range. The σT product obeys an Arrhenius relationship with a composition-independent pre-exponential term A. The value of log A ≈ 4.8 is in agreement with an indirect interstitial mechanism model for sodium cation migration. Isothermal conductivity curves with x show a maximum in the ionic conductivity. This mixed network former effect may be justified by assuming an endothermic mixture between sodium phosphate and sodium tellurate.
ISSN:0167-2738
1872-7689
DOI:10.1016/0167-2738(96)00173-7