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|Title:||Infrared, ESR and optical absorption studies of Cu2+ ions doped in TeO2-ZnO-NaF glass system|
Chandra Mouli, V
|Keywords:||Tellurite glasses;Infrared spectroscopy;ESR;Optical absorption;Cu2+ ions|
|Abstract:||Glasses of composition 80TeO2-(20−x)ZnO-xNaF 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 TeO3, TeO4, Te(O,F)3 and Te(O,F)4 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 Cu2+ 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 (Eopt) and Urbatch energy (ΔE) values were calculated. It is found that Eopt values increase with NaF content. The low ΔE 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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