Elastic and spectroscopic properties of 0.7TeO2–0.1ZnO–0.1NaF–(0.1–x) WO3−xNd2O3 tellurite glasses

Abstract

New tellurite glasses in the composition of 0.7TeO2–0.1ZnO–0.1NaF–(0.1–x) WO3−xNd2O3 and x = 0.005, 0.01, 0.015, 0.025, 0.035, 0.04 and 0.05 mol% were prepared. Density (ρ) and molar volume (Vm) have measured and calculated. Longitudinal and shear ultrasonic wave velocities (Ul, Us) were measured by the pulse-echo technique using Krautkramer USIP 20 at 4 MHz. Moduli of elasticity, longitudinal modulus (L), shear modulus (G), bulk modulus (K), Young’s modulus (E) and Poisson’s ratio (σ) were calculated for every glass sample. The UV spectra in the range 200–2500 nm were measured. The Judd–Ofelt intensity parameters Ωλ (λ = 2, 4, 6) were measured for the whole glass series. The Judd–Ofelt intensity parameters were in the order Ω2 < Ω4 < Ω6 for all Nd3+-doped tellurite glasses. Both oscillator strengths, experimental and calculated (fexp and fcal) from the ground state 4I9/2, were measured. Also, lifetime (τ) and ranching ratio (β) were calculated for each parentage of Nd2O3. Discussion was built on Judd–Ofelt parameters and the dissociation energy of bonds.