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Title: Spectroscopic and <i>dc</i> conductivity studies of Cu<sup>2+</sup> spin probe in 10Li<sub>2</sub>O- <i style="">x</i>Nb<sub>2</sub>O<sub>5</sub>-(89-<i style="">x</i>)TeO<sub>2</sub> glass system
Authors: Babu, J Chinna
Mouli, V Chandra
Keywords: Infrared spectroscopy
Raman spectroscopy
ESR spectroscopy
<i>dc</i> Conductivity
Tellurite glasses
Issue Date: Apr-2009
Publisher: CSIR
Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceName" downloadurl=""><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceType" downloadurl=""><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place" downloadurl=""> DSC,<b> </b>ESR, IR, Raman, optical absorption and <i>dc</i> conductivity studies on<b> </b>10Li<sub>2</sub>O- <i style="">x</i>Nb<sub>2</sub>O<sub>5</sub>-(89-<i style="">x</i>) TeO<sub>2</sub> glasses containing Cu<sup>2+</sup> spin probe have been carried out. Glass transition temperature (<i style="">T<sub>g</sub></i>) and thermal stability of glass samples are estimated from the DSC measurements and it has been found that both increase with increasing the Nb<sub>2</sub>O<sub>5</sub> content. From IR and Raman spectra, it is clear that, the glass system consists of structural units of TeO<sub>3</sub> (tp), TeO<sub>4 </sub>(tbp) and NbO<sub>6 </sub>octahedra. TeO<sub>4</sub> units are found to be converted into TeO<sub>3</sub> units with increase in Nb<sub>2</sub>O<sub>5</sub> content. From ESR spectra, it is found that the Cu<sup>2+</sup> ion is in tetragonal distorted octahedral site with d<sub>x<sup>2</sup>-y<sup>2</sup></sub> as ground state<sub>.</sub> The observed optical absorption peak of Cu<sup>2+</sup> is found to be maximum at 800 nm for 10 mol % of Nb<sub>2</sub>O<sub>5</sub> content. Bonding parameters and per cent bonding symmetry are calculated from both optical and ESR data and are found to change with increase in Nb<sub>2</sub>O<sub>5</sub> content. The observed <i>dc</i> conductivity is found to be increasing with temperature and decreasing with increase in Nb<sub>2</sub>O<sub>5</sub> content. </smarttagtype></smarttagtype></smarttagtype>
Description: 241-247
ISSN: 0019-5596
Appears in Collections:IJPAP Vol.47(04) [April 2009]

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