Role of lithium ions on the physical, structural and optical properties of zinc boro tellurite glasses

摘要: Lithium zinc boro tellurite glasses with compositions xLi2O-(100-x) [0.25ZnO–0.15B2O3–0.60TeO2] [where x = 0, 5, 10, 15 and 20 mol%] have been prepared by melt-quench technique. The amorphous nature of the system is ascertained X-ray diffraction. density molar volume are found to decrease increase in concentration Li2O. differential scanning calorimetry used calculate glass transition temperature (Tg) observed values be decreased. IR Raman spectra indicate that Li2O acts as a network modifier matrix. In present system, tellurium exists TeO4 TeO3, B2O3 form BO4 BO3 oxide ZnO4 structural units. optical band gap estimated from fitting Mott Davis’s model. A better convergence achieved between experimental absorption coefficient hydrogenic excitonic energy increases, whereas refractive index refractivity follow reverse trend range metallization criterion suggests these may potential candidate for nonlinear materials.