Abstract
The goal of this work was to determine the effect of barium oxide on the structural, thermal and optical properties of the TeO2–BaO–Na2O (TBN) and TeO2–BaO–WO3 (TBW) glass systems. Raman spectra allow relating the glass structure and vibration properties (i.e. vibrational frequencies and Raman intensities) with the glass composition. Raman spectra show the presence of TeO4 and TeO3+1/TeO3 units that conform with the glass matrix. Differential thermal analysis DTA, XRD measurements have been considered in term of BaO addition. The spectral dependence of ellipsometric angles of the tellurite–barium glass has been studied. The optical measurements were conducted on Woollam M2000 spectroscopic ellipsometer in spectral range of 190–1700 nm. The reflectance and transmittance measurements have been done on spectrophotometer Perkin Elmer, Lambda 900 in the range of 200–2500 nm (UV–VIS–NIR). From the transmittance spectrum, the energy gap was determined.
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•TeO2–BaO–Na2O glasses are composed of the TeO4 (tbp), (tbp) TeO3+1 and (tp) TeO3.•The more barium the greater the degree of glass network polymerization.•The more barium the higher refractive index of TeO2–BaO–Na2O and TeO2–BaO–WO3 glasses.•The more barium the greater ability of the glass for crystallization.