Vibrational, EPR and optical spectroscopy of the Cu2+ doped glasses with (90–x)TeO2–10GeO2–xWO3 (7.5 ≤ x ≤ 30) composition

Infrared, EPR and optical absorption studies on (90–x)TeO2–10GeO2–xWO3 (7.5 ≤ x ≤ 30) glasses containing Cu2+ spin probe have been carried out. The Infrared spectral studies show that the structure of glass network consists of [TeO4], [TeO3]/[TeO3 + 1], [WO4], [WO6] and [GeO6] units in the disordered manner. Physical parameters such as density (ρ), molar volume (Vm), oxygen packing density (OPD), oxygen molar volume (Vo), optical basicity (Λ), oxide ion polarizability (αO2−), inter ionic distances and the concentration of ions per unit volume of Te, Ge, W, Cu and O have been determined. The spin-Hamiltonian parameters (g||, g⊥ and A||) of Cu2+ ions in the present glasses have been estimated from EPR spectra at 300 K. Bonding parameters such as α2, β12, β2, Γσ, and Γπ have been calculated from both optical absorption and EPR data. The observed variations in spin-Hamiltonian parameters and bonding parameters have been correlated to the structural modifications due to the WO3 incorporation into the TeO2 glass network at constant 10 mol% GeO2 content.