The structural and spectroscopic investigations of ternary tellurite glasses, doped with copper

Abstract

Infrared, EPR and optical absorption studies on (100 − 2 x)TeO 2– xAg 2O– xWO 3 (7.5 ≤ x ≤ 30) glasses containing Cu 2+ spin probe have been carried out. The infrared spectral studies show that the structure of glass network consists of [TeO 4], [TeO 3]/[TeO 3+1], [WO 4] units in the disordered manner. Physical parameters such as density ( ρ), molar volume ( V m), oxygen packing density (OPD), oxygen molar volume ( V O), copper ion concentration ( N) and mean copper ion separation ( R) have been determined. The spin-Hamiltonian parameters ( g ||, g ( and A ||) of Cu 2+ ions in the present glasses have been estimated from EPR spectra at 300 K. Bonding parameters such as α 2, β 1 2 , β 2, Γ σ, Γ π 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 WO 3 and Ag 2O incorporation into the TeO 2 glass network.