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Title: ESR, IR and optical absorption studies of Cu<sup>2+</sup> spin probe in <i style="">x</i>Na<sub>2</sub>O-(50-<i style="">x</i>)ZnO-50B<sub>2</sub>O<sub>3</sub> ternary glasses
Authors: Babu, J Chinna
Suresh, S
Mouli, V Chandra
Keywords: ESR absorption
IR absorption
Optical absorption
Cu<sup>2+</sup> spin probe
Issue Date: Nov-2005
Publisher: CSIR
Series/Report no.: G01J3/42
Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceType"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceName"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"> ESR, IR and optical absorption studies on<b style=""> </b><i style="">x</i>Na<sub>2</sub>O-(50-<i style="">x</i>)ZnO-50B<sub>2</sub>O<sub>3</sub> ternary glasses containing Cu<sup>2+</sup> spin probe have been carried out. The absence of band at 806 cm<sup>-1</sup> in the IR spectra indicates the absence of boroxol rings. Thus, the present glass system consists of borate triangles [BO<sub>3</sub>] and borate tetrahedral [BO<sub>4</sub>] structural units. It was also observed that structural changes are taking place with variation of Na<sub>2</sub>O and ZnO contents. The hyperfine splittings in the parallel features of ESR spectra of Cu<sup>2+</sup> are recorded for all compositions. ESR results show that the <b style="">g</b><sub>|| ></sub> <b style="">g</b><sub>⊥<b style=""> </b></sub>indicating that the Cu<sup>2+</sup> ion is in tetragonal distorted octahedral site and its ground state is <i style="">d</i><sub>x2</sub><sub>-y2.</sub> There is considerable variation in <b style="">g<sub>||</sub></b><sub> </sub>and <b style="">A</b><sub>||<b style=""> </b></sub>values with the increasing concentration of Na<sub>2</sub>O, whereas no perceptible changes have been observed in <b style="">g</b><sub>⊥ </sub>and <b style="">A</b><sub>⊥ </sub>values. The observed optical absorption peak of Cu<sup>2+</sup> has been found to be at 800 nm for <i style="">x</i>=25 mol% of Na<sub>2</sub>O content. Bonding parameters are calculated from both optical and ESR data. All these variations clearly indicate the structural changes in the present glass system with varying Na<sub>2</sub>O content.<b style=""></b> </smarttagtype></smarttagtype></smarttagtype>
Description: 833-837
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.43(11) [November 2005]

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