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Mixed conductivity of glasses in the P2O5-V2O5-Na2O system

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Abstract

The conductivity of glasses in the P2O5−[(1−x) V2O5−x Na2O] system is studied as a function of temperature and composition. For all compositions, the conductivity variations as a function of temperature follow an Arrhenius type relationship:\(\sigma = \frac{A}{T}\exp \left( { - \frac{{E_a }}{{RT}}} \right)\). The activation energies and pre-exponential factors corresponding to the V2O5 richest compositions are lower than that corresponding to the ionic ones. Isothermal variations of the conductivity as a function of composition show a deep minimum for a molar ratio x near 0.65. On either side of this minimum, the conductivity is mainly electronic (x<0.7) or ionic (x>0.8). The variations are interpreted assuming a prevailing diluting effect of the non predominantly present oxide without any interactions between the electronic and ionic charge carriers.

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Authors and Affiliations

  1. Laboratoire d'Electrochimie et Physico-chimie des Matériaux et Interfaces, UMR 5631 associée à l'U.J.F., Ecole Nationale Supérieure d'Electrochimie et d'Electrométallurgie de Grenoble, 1130 rue de la Piscine, B.P. 75 - 38402, Saint Martin d'Hères, France

    M. Lévy & J. L. Souquet

  2. Laboratoire de Technologie du Verre, Département Science et Ingénierie des Matériaux à base d'Oxydes, Université Polytechnique de Bucarest, C.P. 12 - 134, Bucarest, Roumanie

    M. C. Ungureanu

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  1. M. C. Ungureanu
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  2. M. Lévy
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  3. J. L. Souquet
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Ungureanu, M.C., Lévy, M. & Souquet, J.L. Mixed conductivity of glasses in the P2O5-V2O5-Na2O system. Ionics 4, 200–206 (1998). https://doi.org/10.1007/BF02375946

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  • DOI: https://doi.org/10.1007/BF02375946

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