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ISRN Spectroscopy
Volume 2012 (2012), Article ID 583015, 5 pages
http://dx.doi.org/10.5402/2012/583015
Research Article

EPR and Optical Absorption Spectral Investigations of Cu2+ in Bi2O3-ZnO-B2O3-Li2O Glasses

Department of Physics, Osmania University, Hyderabad 500 007, India

Received 25 February 2012; Accepted 28 March 2012

Academic Editors: W. A. Badawy, J. Casado, and M. Mączka

Copyright © 2012 Shashidhar Bale and Syed Rahman. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Electron paramagnetic resonance and optical absorption studies of Bi2O3-ZnO-B2O3-Li2O glasses were made by introducing Cu2+ as spin probe. The EPR spectra of Cu2+ in all the glass samples recorded in the X-band frequency have similar spectral features. The variation in glass composition influences the spin Hamiltonian parameters calculated from the spectra. The spin Hamiltonian parameters indicate that the Cu2+ ions are coordinated with six ligand atoms in a distorted octahedron elongated along one of the axes and the ground state of the Cu2+ is dx2y2 orbital. The optical absorption spectra exhibited a broad band corresponding to d-d transition bands of Cu2+ ion. The values of bonding parameters indicate a covalent nature for the in-plane σ bonding and pure ionic nature for the in-plane and out-of-plane π bonding. The theoretical optical basicity parameter values were evaluated, and it was observed that the value of Γσ increases whereas Γπ decreases with the increase in optical basicity.