Thermal, structural and optical properties of TeO2–Na2O–TiO2 glassy system

In this work, 80TeO2–(20 − x) Na2O–xTiO2 (x = 0, 5, 10 and 20) mol% glasses by melting quenching technique were obtained. Density (ρ) and molar volume (Vm) of these glasses have been investigated. The characterization was performed by X-ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) and ultraviolet–visible (UV–Vis) spectroscopy. As expected, the Vm values decreased with x increasing, exhibiting a density opposite behavior. DSC, FTIR and UV–Vis results indicated that, with the increasing the TiO2 content, the role of this oxide changes from network modifier to former. In addition, more covalent bonds are formed, reinforcing the network connectivity by increasing the Te–O–Ti inter-chain bounds. These features improved the glassy system thermal and optical properties.