Abstract
Different glasses in the system xPbF2: (1 — x)[PbO : TeO2] have been synthesized and investigated. The effects of increasing PbF2 contents on material properties such as glass transition temperature (Tg), thermal expansion coefficient (α), microhardness (Hv), and electrical conductivity (σ) are studied. Addition of PbF2 to the lead tellurite network can increase the conductivity by increasing both carrier concentration and mobility. The activation energy for conduction (Ea) was found to decrease upon increasing PbF2 contents. Decreasing of Ea with increasing PbF2 was discussed on the basis of modifying the channel network by expanding, opening and weakening the bonds constituting the skeleton of the glass. The opened structure of the lead tellurite network is found to have a direct effect on the ionic conduction of the glasses. The conductivity is enhanced by more than seven orders of magnitude upon addition of 50 mol% PbF2. The random site model is proposed to explain the fluorine ion transport mechanism in the studied glasses.
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