Thermal, FTIR and UV spectral studies on tellurite glasses doped with cerium oxide

摘要

AbstractTellurium oxide-based glasses in the form of 75TeO2– 10ZnO – (10-x)Nb2O5– 5Li2O – xCe2O3; where x = 0.5, 1, 1.5, 2, 2.5mol%, were prepared by using the melt-quenching method. X-Ray Diffraction pattern (XRD) detected the amorphous nature of all the prepared glasses. Physical properties like density (ρ), molar volume(Vm), and oxygen packing density (OPD), have been determined and calculated. Fourier transform infrared spectroscopy (FTIR) studies showed that the glass network contains TeO4, TeO3+1/TeO3, ZnO4, and NbO6as structural units. The glass transition temperature (Tg), onset of glass crystallization temperature (Tx), crystallization temperature (Tc), and melting temperature (Tm) have been determined by using differential scanning calorimetry (DSC). The optical band gap (Eopt), the Urbach energy (?E), and the cut off wavelength (λc) were determined through the optical absorption data.Graphical abstractThe DSC and De-convoluted FTIR spectra of 75TeO2– 10 ZnO – 7.5Nb2O5– 5Li2O – 2.5 Ce2O3(TZNLC5) glass systemDisplay OmittedHighlights?XRD analysis proves the amorphous nature of the glass system.?FTIR exhibit that the glass contains ZnO4, TeO4, TeO3+1/TeO3as structural units.?The glass transition temperature Tg increased by increasing Ce2O3concentration.?The optical band gap (Eopt) increases by increasing the concentration of Ce2O3.