Understanding the structure of single-component glasses is essential for developing structural models of more complex multicomponent glasses. Currently, such models for tellurite systems are purely qualitative. This study presents neutron diffraction and Raman spectroscopy measurements of the structure of pure amorphous TeO 2, showing that it is formed from a combination of two-thirds [TeO 4 ] pseudo-trigonal bipyramids and one-third [TeO 3 ] trigonal pyramids with a terminal oxygen. This is in contrast to all crystalline polymorphs of TeO 2, which are formed solely from the four-coordinated units. Using this result, a quantitative model has been developed that successfully predicts the average Te–O coordination number, n TeO, for a series of potassium tellurite glasses, x K 2 O·(100 – x )TeO 2 . The observed n TeO is constant up to 15 mol % K 2 O due to the presence of terminal oxygen atoms in the tellurite network.
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Barney et al. (2013) studied this question.
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