Glass Formation and Characterization Studies in the TeO 2 – WO 3 – Na 2 O System

Abstract

Glass formation behavior of the TeO 2 – WO 3 – Na 2 O system was studied by using conventional melt‐quenching technique. A wide glass formation range was determined for the first time in the literature and thermal, physical, and structural characterization of sodium‐tungsten‐tellurite glasses were realized using differential scanning calorimetry ( DSC ) and Fourier transform infrared ( FTIR ) spectroscopy techniques. Glass transition ( T g ) and crystallization ( T c / T p ) temperatures, glass stability ( ∆T ), density (ρ), molar volume ( V M ), oxygen molar volume ( V O ), and oxygen packing density ( OPD ) values and structural transformations in the glass network were investigated according to the equimolar substitution of TeO 2 by Na 2 O + WO 3 and changing Na 2 O or WO 3 at constant TeO 2 .