NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.47 [2009] >
IJPAP Vol.47(03) [March 2009] >


Title: ESR, IR, Raman and optical absorption studies of 60 B2O3 + 10 TeO2 +5TiO2 +24 R2O: 1CuO (where R=Li, Na, K) quaternary glasses
Authors: Suresh, S
Prasad, M
Upender, G
Kamalaker, V
Mouli, V Chandra
Keywords: Boro-tellurite
Spectroscopic studies
Quaternary glasses
Issue Date: 2006
Publisher: CSIR
Abstract: ESR, IR, Raman and optical absorption spectra of 60 B2O3 + 10 TeO2 +5TiO2+24 R2O (where R = Li, Na and K) quaternary glasses containing Cu2+ spin probe have been studied. IR results show the BO3-BO4- ring structure interconnected by TeO3- and TeO4- groups, where the BO4- groups are neighbours of the TeO3-groups. BO3 → BO4 transition is also observed, which correlates with the conversion of TeO4 →TeO3. From Raman spectra, a weak band recorded at 805 cm-1 clearly indicates the presence of boroxol rings for potassium boro-tellurite glass alone. From ESR spectra, the three weak parallel components are observed in the low field region. However, the perpendicular components are not resolved leading to an intensive line in the high field region. When one kind of alkali oxide is replaced by another, the Spin Hamiltonian parameters have been found to vary drastically. The spin Hamiltonian parameter values indicate that the ground state of Cu2+ is dx2- y2 and the site symmetry around the Cu2+ ion is tetragonally distorted octahedral coordination. Optical absorption peak of Cu2+ is found to be a maximum at around 794 nm for Li2O containing borate rich glasses. This peak shifts towards the lower wavelength side as Li2O is replaced with Na2O, K2O. Bonding parameters indicate a slight covalency for the in-plane σ bonding as compared to in-plane and out-of-plane π bonds.
Page(s): 163-169
ISSN: 0019-5596
Source:IJPAP Vol.47(03) [March 2009]

Files in This Item:

File Description SizeFormat
IJPAP 47(3) 163-169.pdf223.51 kBAdobe PDFView/Open
 Current Page Visits: 734 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 558507 since 06-Feb-2009  Last updated on 30-Jul-2014Webmaster: nopr@niscair.res.in