Abstract
The structure of technologically important tellurite glasses has been studied by Raman spectroscopy. The present investigation revealed the presence of TeO4 trigonal bipyramid, TeO3 trigonal pyramid, and NbO6 octahedra in these glasses. The influence of a gradual addition of the modifier oxides on the glass structure has been elucidated. The evolution of TeO3 units with the modifier addition was different from the earlier reports on the tellurite glasses. Even at higher modifier concentrations TeO4 units were dominating in the glass network compared to TeO3, though NbO6 octahedra also come into the picture. The ratio of TeO4∕TeO3 structural units was discussed for different series of glass compositions. An attempt has been made based on these structural details obtained via Raman studies to explain the origin of the greatly improved thermal stabilities and refractive indices of these glass compositions.
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