Abstract
Glasses with composition xWO3·(30−x)M2O·70B2O3 (M=Li, Na; 0≤x≤15) doped with 2mol% V2O5 have been prepared using the melt–quench technique. The electron paramagnetic resonance spectra have been recorded in X-band (ν≈9.14GHz) at room temperature (RT). The spin Hamiltonian parameters, dipolar hyperfine coupling parameter and Fermi contact interaction parameter have been calculated. It is observed that the resultant resonance spectra contain hyperfine structures (hfs) only due to V4+ ions, which exist as VO2+ ions in octahedral coordination with a tetragonal compression in the present glass system. The tetragonality increases with WO3:M2O ratio and also there is an expansion of 3dxy orbit of unpaired electron in the vanadium ion. The study of IR transmission spectra over a range 400–4000cm−1 depicts the presence of WO6 group. The DC conductivity (σ) has been measured in the temperature range 423–623K and is found to be predominantly ionic.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
