Ceramics-Silikáty 44, (3) 81 - 85 (2000) |
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IONIC AND ELECTRONIC CONDUCTIVITY OF GLASSES IN THE P₂O₅-V₂O₅-Na₂O SYSTEM
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Ungureanu Maria-Camelia 1, Lévy Michel 2, Souquet Jean-Louis 2
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1 Laboratoire d'Electrochimie et Physico-chimie des Matériaux et Interfaces
UMR 5631 associée a l'U.J.F
Laboratoire de Technologie du Verre
Département Science et Ingénierie des Matériaux a base d'Oxydes
Université Polytechnique de Bucarest, C.P. 12 - 134 Bucarest, Roumanie
2 Ecole Nationale Supérieure d'Electrochimie et d'Electrométallurgie de Grenoble
1130 rue de la Piscine, B.P. 75 - 38402 Saint Martin d'Heres, France
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The conductivity of glasses in the y P₂O₅ - (1-y) [(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. The activation energy and pre-exponential factor values determined for the V₂O₅ richest compositions are lower
than those obtained for the rich ionic domain. Isothermal variations of the conductivity as a function of composition show
deep minima for molar ratios x near 0.65. On either side of these minima, the conductivity is mainly electronic (x ˂ 0.6) or
ionic (x ˃ 0.8). The variations are interpreted assuming a prevailing diluting effect of the non predominantly present oxide
with no interactions between the electronic and ionic charge carriers. |
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