Abstract
Zinc bismuth sodium borate glasses with chemical composition (50-x)Bi2O3-30B2O3-(x-0.5)ZnO-20Na2CO3-(0.5)V2O5 [where x = 10, 15, 20, 25] were prepared by melt quenching technique. The prepared samples were studied by means of XRD, EPR, optical absorption and FTIR techniques. The amorphous nature was confirmed by the X-ray diffraction studies. The spin-Hamiltonian parameters (g & A) values, number of spins and paramagnetic susceptibility values have been calculated. The spin-Hamiltonian parameters indicate that the present glass samples are in octahedral sites with tetragonal distortion. The optical absorption spectra of VO2+ ions in the present glass system show single absorption band at ≈ 628 nm. The optical bandgap energies (Eopt) and Urbach energies (ΔE) have been calculated from the ultraviolet edges. The FTIR spectra reveal the BO, BO3, ZO, and BO4 bands in the present glass system.
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