Abstract
Tellurite glasses were prepared with identical 20Li(2)O-80TeO(2) nominal
compositions but with different thermal histories. Differential scanning
calorimetry (DSC), X-ray diffraction (XRD) and Raman spectroscopy
techniques were used to understand the effects of the thermal histories
on the thermal and structural properties of these glasses. It was
observed that investigated properties depend strongly on the thermal
histories. DSC results suggested that annealing immediately after
quenching at temperatures around the glass transition temperature (T(g))
and for longer times is favorable for producing local ordered regions in
the glass withoug necessarily increasing the number of nuclei. XRD
results revealed the crystallization of the gamma-TeO(2), alpha-TeO(2)
and alpha-Li(2)Te(2)O(5) phases in both studied glasses. Raman
spectroscopy revealed the metastable character of the gamma-TeO(2)
crystalline phase, while the alpha-TeO(2) and alpha-Li(2)Te(2)O(5)
crystalline phases persisted up to the final stages of the in-situ
crystallization.
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