Abstract
Electron paramagnetic resonance (EPR) and optical absorption studies of xMgO- (25-x) Li2O-50B2O3-25As2O3 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.
Highlights
Heavy metal oxide based glasses containing As2O3 has received significant attention owing to their interesting optical applications
Electron paramagnetic resonance (EPR) behaviors of oxide glasses doped with transition metal (TM) ions have been extensively studied to obtain information on the glassy network and to identify the site symmetry around the TM ions[7,8,9,10]
We report EPR and optical absorption studies of Cu2+ spin probe in the quaternary glass system xMgO-(25-x)Li2O-50B2O3-25As2O3
Summary
Heavy metal oxide based glasses containing As2O3 has received significant attention owing to their interesting optical applications. These glasses have large non-linear optical susceptibility coefficient[1,2,3,4] that makes them suitable for potential applications in non-linear optical devices (such as ultra-fast optical switches and power limiters), broad band optical amplifiers operating around 1.5 μm and in a number of solid state ionic devices. Sumalatha et al.[12], Hayder Khudhair Obayes et al.[13], Edukondalu et al.[14] studied the local structure around Cu2+ ion in oxide glasses by EPR spectra.
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