Dielectric properties, polarizability and molar refractive index of some VSrFeZnO glasses

Dielectric properties of a set of glasses having the composition (70-x)%V2O5 - x%ZnO − 10%SrO − 20%FeO is studied in terms of their permittivity and electric modulus. The dielectric data are collected at the frequencies 120, 103, 104 and 105 Hz and in the temperature range 300 − 523 K. The electric moduli are treated with different theoretical models. Good fitting to the experimental data are obtained with Cole–Cole and Davidson–Cole equations. The static relaxation time τ0 values are found to vary between 7.6x10−9 sec and 22.7x10−9 sec, and the parameters α and γ are found to be (α = 0.056 − 0.065) and (γ = 0.94 − 0.95). The calculated optical basicity values are found to decrease with increasing the %ZnO. The molar refractive index is found to be between 2.6 and 3.2. The calculated single bond strength values suggest the transfer of bond nature from the covalent to the ionic form. The obtained third-order nonlinear optical susceptibility χ(3) results and electronic polarizability calculations suggests these glasses to be good nominees for nonlinear optical applications.