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Influence of ion distribution on the ionic conductivity of lithium tellurite glasses (Li 2OTeO 2 and LiFTeO 2)

TeO 2 forms stable glasses with Li 2O and LiF in a large range of compositions (from 0.45 to 0.9 in molar ratio of TeO 2). The ionic conductivity of these glasses is measured as a function of temperature and chemical composition by the complex impedance method (frequency range: 10 −2 −10 4 Hz, tempe...

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Published in:Journal of non-crystalline solids 1990-02, Vol.116 (2), p.167-174
Main Authors: Rojo, J.M, Sanz, J, Reau, J.M, Tanguy, B
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Language:English
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description TeO 2 forms stable glasses with Li 2O and LiF in a large range of compositions (from 0.45 to 0.9 in molar ratio of TeO 2). The ionic conductivity of these glasses is measured as a function of temperature and chemical composition by the complex impedance method (frequency range: 10 −2 −10 4 Hz, temperature range: 100°C− T g_. A parallel study by 7Li- and 19F-NMR spectroscopy allows identification of Li + ions as the carriers responsible for the ionic conductivity of these solids. From the second moment of NMR signals, two different distributions of lithium are proposed: one in which Li + ions are dispersed in Li 2OTeO 2 glasses and another one, in which Li + and F − ions are associated in the network of LiFTeO 2 glasses. These distributions are correlated with ionic conductivity results.
doi_str_mv 10.1016/0022-3093(90)90689-J
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subjects Condensed matter: structure, mechanical and thermal properties
Diffusion in solids
Exact sciences and technology
Physics
Theory of diffusion and ionic conduction in solids
Transport properties of condensed matter (nonelectronic)
title Influence of ion distribution on the ionic conductivity of lithium tellurite glasses (Li 2OTeO 2 and LiFTeO 2)
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