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http://nopr.niscpr.res.in/handle/123456789/34247| Title: | Spectroscopic studies of Cu2+ spin probe in sodium niobium based tellurite glasses |
| Authors: | Babu, J Chinna Mouli, V Chandra |
| Keywords: | Tellurite glasses;Electron spin resonance spectra;IR spectra;Raman spectra;Optical absorption spectra |
| Issue Date: | May-2016 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Differential scanning calorimetry (DSC), electron spin
resonance (ESR), Raman, infrared (IR) and optical absorption studies on 10Na2O-xNb2O5-(89-x)TeO2-1CuO
glasses (where x =0, 5, 10, 15 and 20 mol%) containing Cu2+ spin
probe have been carried out. Glass transition temperature (Tg) and thermal stability of glass samples have been
estimated from the DSC measurements and it has been found that both increase
with increasing the Nb2O5 content. From Raman and
IR spectra, it is clear that present glass system consists of structural units
of TeO3 (tp) and TeO4 (tbp) and NbO6 octahedra.
Also, TeO4 units convert into TeO3 units with change in
Nb2O5 content. The hyperfine splittings in the parallel
features of ESR spectra of Cu2+ are recorded for all compositions.
ESR results show that g|| >
g indicating that the Cu2+
ion is in tetragonal distorted
octahedral site and its ground state is dx2- y2. There is
considerable variation in Hamiltonian parameters for the different
compositions. The observed optical absorption peak of Cu2+
is found to be maximum at 780 nm for 10 mol% of Nb2O5
content. Bonding parameters and %
bonding symmetry are calculated from both optical and ESR data changing with
increasing Nb2O5 content. |
| Page(s): | 339-345 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Appears in Collections: | IJPAP Vol.54(05) [May 2016] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJPAP 54(5) 339-345.pdf | 297.34 kB | Adobe PDF | View/Open |
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