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Study of Electron Paramagnetic Resonance and Optical Absorption of Vanadyl ions in Sodium Fluoroborate Glasses

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Author Affiliations

  • 1Department of Physics, University College of Science, Osmania University, Hyderabad, INDIA

Res. J. Physical Sci., Volume 1, Issue (7), Pages 15-19, August,4 (2013)

Abstract

Sodium fluoroborate glasses were prepared using standard conventional melt-quench technique. Electron paramagnetic resonance (EPR) and optical absorption spectra of Vanadyl ions in different alkali fluoroborate glasses were studied. The spin-Hamiltonian parameters (g and A), Fermi contact interaction parameter (k) and crystal field parameters were evaluated. The values of spin-Hamiltonian parameters confirm that vanadyl ions are present in the glasses as VO2+molecular ions in an octahedral site with a tetragonal compression. The optical properties of present glass system were studied from the optical absorption spectrarecorded in the wavelength range 200-800 nm. The fundamental absorption edge was identified.The values of optical band gap for direct and indirect allowed transitions and Urbach energies were determined. The effect of alkaline-earth metal on these properties is discussed.

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