Abstract
Raman, IR and DSC studies have been carried on the (100 − x)TeO 2– xWO 3 (TW) glasses with 10 ≤ x ≤ 40 mol%. The Raman, IR spectra of these samples show that glass network consists of [TeO 3]/[TeO 3+1], [TeO 4], [WO 4] and [WO 6] groups as basic structural units. The W ion coordination state changes from 4 to 6 when WO 3 concentration increases beyond 30 mol%. Addition of WO 3 oxide to the TW glasses increases the amount of lower coordination of [TeO 3]/[TeO 3+1] units and decreases the higher coordination [TeO 4] units, Te–O–Te chains. From DSC thermogram, thermal properties such as the glass transition temperature ( T g), onset crystallization ( T o) of the glass systems were calculated. The compositional variation of glass transition temperature ( T g) is found to linear with an increase in WO 3 content.
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