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Title: ESR, IR and optical absorption studies of Cu2+ spin probe in xNa2O-(50-x)ZnO-50B2O3 ternary glasses
Authors: Babu, J Chinna
Suresh, S
Mouli, V Chandra
Keywords: ESR absorption
IR absorption
Optical absorption
Cu2+ spin probe
Issue Date: Nov-2005
Publisher: CSIR
IPC CodeG01J3/42
Abstract:  ESR, IR and optical absorption studies on xNa2O-(50-x)ZnO-50B2O3 ternary glasses containing Cu2+ spin probe have been carried out. The absence of band at 806 cm-1 in the IR spectra indicates the absence of boroxol rings. Thus, the present glass system consists of borate triangles [BO3] and borate tetrahedral [BO4] structural units. It was also observed that structural changes are taking place with variation of Na2O and ZnO contents. The hyperfine splittings in the parallel features of ESR spectra of Cu2+ are recorded for all compositions. ESR results show that the 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 g|| and A|| values with the increasing concentration of Na2O, whereas no perceptible changes have been observed in gand Avalues. The observed optical absorption peak of Cu2+ has been found to be at 800 nm for x=25 mol% of Na2O 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 Na2O content.
Page(s): 833-837
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.43(11) [November 2005]

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