Optical, EPR and FT–IR studies of VO2+ doped X Li2O– (50–X) K2O– 50 B2O3(10ââ€Â°ÃÂXââ€Â°ÃÂ30) glasses

G. Srinivasa Rao; P. Narayana Murthy; R.V.S.S.N. Ravikumar

Volume : V, Issue : VII, July - 2015

Optical, EPR and FT–IR studies of VO2+ doped X Li2O– (50–X) K2O– 50 B2O3(10ââ€Â°ÃÂXââ€Â°ÃÂ30) glasses

G. Srinivasa Rao, P. Narayana Murthy, R. V. S. S. N. Ravikumar

Abstract :

The effect of Li2O content in vanadyl doped X Li2O + (50–X) K2O + 50 B2O3 (10≤X≤30) (LKB) glasses has been studied with respect to their physical and structural properties. The physical parameters like density, refractive index, ionic concentration and electronic polarizability vary non–linearly with x mol% depending on the diffusivities of alkali ions. EPR and optical absorption spectra reveal that the resonance signals are characteristics of VO2 + ions in tetragonallycompressed octahedral site. Spin–Hamiltonian, crystal field, tetragonal field and bonding parameters are found to be in good agreement with the other reported glass systems. The optical band gap and Urbach energies exhibited the mixed alkali effect.