Impact of Yb2O3 on the physical, bonding, dispersion and dielectric properties of Li2O–ZnO–P2O5 glasses

Abstract

Li2O–ZnO–P2O5 (LZP) glasses doped with Yb2O3 were synthesized by the melt quenching technique (MQT). The amorphous nature of the samples was confirmed using X-ray diffraction (XRD) patterns. Density (ρ) and molar volume (Vm) were measured. The absorbance (A) and transmittance (T) spectra were recorded in the range of 190–1200 nm wavelength. The physical parameters such as polaron radius (rp), phosphorus-phosphorus distance (Dp-p), and bonds number per unit volume were estimated using different formulae. Absorption spectrum fitting (ASF) and its derivation (DASF) methods were used to estimate the direct (D) and indirect (I) optical band gap (EASFD.,I., EDASF) and Urbach's energy (Eu). EASFD., EASFI., EDASF, and Eu were found to be within (5.312–5.161 eV), (4.941–4.720 eV), (5.447–5.250 eV) and (0.151–0.177 eV), respectively. Refractive index (n), electronic polarizability (αO2−), optical basicity (Λ), and an interaction parameter (A) were studied from the obtained values of the EASFI. for the investigated glasses. The single oscillator energy (Eo) and dispersion energy (Ed) were deduced from the Wemple-DiDomenico model. Dielectric parameters (ϵ' and ϵ") and ac conductivity (σac.) were measured in the frequency range 100 Hz −100 kHz at room temperature. Effects of doping Yb2O3 on investigated parameters are interpreted.