| Numéro |
J. Phys. IV France
Volume 02, Numéro C2, Octobre 1992
European Workshop on Glasses and Gels
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|---|---|---|
| Page(s) | C2-165 - C2-170 | |
| DOI | https://doi.org/10.1051/jp4:1992222 | |
J. Phys. IV France 02 (1992) C2-165-C2-170
DOI: 10.1051/jp4:1992222
Influence of the fluorine-oxygen substitution on the ionic conductivity properties of lithium tellurite glasses
J. M. REAU1, B. TANGUY1, J. PORTIER1, J. M. ROJO2, J. SANZ2 and M. P. HERRERO21 Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux I, 351 Cours de la Libération, 33405 Talence Cedex, France
2 Instituto de Ciencia de Materiales, CSIC, Madrid, Spain
Abstract
A large range of glassy compositions has been found inside the ternary LiF-Li2O-TeO2 system. The influence of the fluorine-oxygen substitution on the ionic conduction properties of (50-x)LiO0.5-(x)LiF-(50)TeO2 ([MATH]) glasses has been investigated. These results have been correlated with the data relative to ion distribution and microstructure obtained by NMR and TEM. A maximum of conductivity associated with a minimum of activation energy is observed for [MATH]. The composition dependence of conductivity with rising x can be explained by a progressive decrease of the F-F associations around the Te4+ ions and a simultaneous increase of the Li-F associations. The clustering of the Li+ and F- ions produces small domains which hinder the Li+ ions diffusion in these glasses.
© EDP Sciences 1992