EPR and Optical Absorption Studies of Cu2+ Doped MgO-Li2O-B2O3-TeO2 Glasses

Authors

  • Kalsani Venkateshwarlu  Department of Physical Sciences, Kakatiya Institute of Technology & Science, Warangal, India
  • Bachchewal Sreenivas  Department of Physics, Osmania University, Hyderabad, India

Keywords:

Electron Spin Resonance, spin-Hamiltonian, Glass, Optical Absorption.

Abstract

Electron paramagnetic resonance (EPR) and optical absorption studies of xMgO- (25-x) Li2O-55B2O3-20TeO2 glasses were made by introducing Cu2+ as a spin probe. The EPR spectra of all the glass samples recorded at X-band frequencies have similar spectral features. The Cu2+ ions are in well-defined axial sites, but subjected to small distortion leading to the broadening of the spectra. The spin-Hamiltonian parameter values indicate that the ground state of Cu2+ is dx2- y2 and the site symmetry around Cu2+ ions is tetragonal distorted octahedral. The optical absorption spectra exhibited a broadband corresponding to the d-d transition bands of Cu2+ ion. By correlating EPR and optical data, the bond parameters were evaluated and the values show purely ionic nature for the in-plane σ bonding and in-plane π bonding. The out-of-plane π bonding is moderately covalent.

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International Journal of Scientific Research in Science and Technology

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Published

2016-08-31

Issue

Volume 2, Issue 4, July-August-2016

Section

Research Articles

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How to Cite

[1]
Kalsani Venkateshwarlu, Bachchewal Sreenivas, " EPR and Optical Absorption Studies of Cu2+ Doped MgO-Li2O-B2O3-TeO2 Glasses, International Journal of Scientific Research in Science and Technology(IJSRST), Online ISSN : 2395-602X, Print ISSN : 2395-6011, Volume 2, Issue 4, pp.305-308, July-August-2016.