Abstract
Electron paramagnetic resonance (EPR) of VO2+ions in sodium borate glass system has been studied over a wide range of composition. The EPR spectra exhibited hyper fine splitting (hfs) due to considerable weakening of interaction between vanadium ion concentrations. The hfs is seen between 10 and 35 mol% of vanadium concentration. The appearance of hfs is due to the interaction of 3d1 electron spin of 51V ion with its nuclear spin, which increases with increasing concentration till 35 mol%. The spin -Hamiltonian parameters (g and A), the dipolar hyperfine coupling parameter (P) and Fermi contact interaction parameter (k) have also been evaluated. The values of spin-Hamiltonian parameters indicate that VO2+ ions are in octahedral coordination with a tetragonal compression which can be attributed to the structural changes taking place with the increasing concentration of V2O5
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