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|Title:||Infrared, ESR and optical absorption studies of Cu<sup>2+</sup> ions doped in TeO<sub>2</sub>-ZnO-NaF glass system|
Chandra Mouli, V
|Abstract:||Glasses of composition 80TeO<sub>2</sub>-(20−<i style="">x</i>)ZnO-<i style="">x</i>NaF mol % were prepared by melt quenching technique and characterized by ESR, optical absorption and infrared spectroscopy. The IR spectra reveal that the glass consists of TeO<sub>3</sub>, TeO<sub>4</sub>, Te(O,F)<sub>3 </sub>and Te(O,F)<sub>4</sub> units as local structure of the glass network. The hydroxyl group concentration decreases with the increase of NaF content. From ESR spectra, it is found that the Cu<sup>2+</sup> ions are in octahedral sites with tetragonal distortion with as ground state. From the ESR and optical absorption studies, molecular orbital coefficients were calculated and correlated with the structural variation of the glass system. From the optical absorption data, the optical band gap (<i>E</i><sub>opt</sub>) and Urbatch energy (Δ<i>E</i>) values were calculated. It is found that <i>E</i><sub>opt</sub> values increase with NaF content. The low Δ<i>E</i> values showed that the present glasses were highly homogenous and stable.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.48(10) [October 2010]|
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