Gadolinium doping of vanadate-tellurate glasses and glass ceramics
2008
In order to further elucidate the local structure of ternary xGd₂O₃(100 − x)[0.7TeO₂ · 0.3V₂O₅] glasses with x = 0, 5, 10, 15, 20 mol%, FTIR spectroscopy, XRD diffraction and density measurement were performed. FTIR and density data show that by increasing the gadolinium ions content of the samples the excess of oxygen may be accommodated by the inter-conversion of some [VO₄] into [VO₅] structural units and of [TeO₃] into [TeO₄] units. The composition of the heat-treated glasses was found to consist mainly of the Te₂V₂O₉ crystalline phase. Varying x between 15 and 20 mol% Gd₂O₃ produces structural modification having as result an increase of the glass network polymerization degree. Accordingly, the gadolinium ions play a particular role related to the improvement of the homogeneity of the glasses and in accommodating the glass network with the excess of oxygen.
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