Abstract
In this paper, we have examined and analyzed the effects of systematic intercalation of the lead ions on vanadate–tellurate glass ceramics with interesting results. The structural properties of the lead–vanadate–tellurate glass ceramics of compositions xPbO·(100 − x)[6TeO2·4V2O5], x = 0 − 100 mol%, are reported for the first time. It has been shown by X-ray diffraction that single-phase homogeneous glasses with a random network structure can be obtained in this system. Among these unconventional lead–vanadate–tellurate glass ceramics, we found that network formers are good host material for lead ions and are capable to intercalate a variety of species such as Te2V2 5+O9, Pb3(V5+O4)2, Pb2V2 5+O7, and V2O5-rich amorphous phase. On the other hand, these glass ceramics contain V4+ and V5+ ions necessary for the electrical conduction. Based on these experimental results, we propose that the V4+=O bonds are created by two different mechanisms: the first of reduction of V5+ ions to V4+ ions and thus of creation of V4+=O bonds.
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