Singh, Shiv Prakash and Chakradhar, R P S and Rao, J L and Karmakar, Basudeb (2010) EPR, FTIR, optical absorption and photoluminescence studies of Fe(2)O(3) and CeO(2) doped ZnO-Bi(2)O(3)-B(2)O(3) glasses. Journal of Alloys and Compounds, 493 (1-2). pp. 256-262. ISSN 0925-8388

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Abstract

Glasses containing heavy metal oxide of the composition (wt.%) 23B(2)O(3)-5ZnO-72Bi(2)O(3)-xFe(2)O(3)/CeO(2) (0 <= x <= 0.0058 at.% in excess) were prepared by melt quenching technique. The glass formation was confirmed by XRD. FTIR spectra exhibit characteristic absorption bands for B(2)O(3) and Bi(2)O(3) for their various structural units. The EPR spectra exhibit two resonance signals at g approximate to 6.4 and g approximate to 4.2 for Fe(2)O(3) doped glasses. The resonance signals at g approximate to 4.2 and g approximate to 6.4 are attributed to Fe(3+) ions in rhombic and axial symmetry sites. respectively. The number of spins participating in resonance (N) and its paramagnetic susceptibility (chi) with composition has been evaluated. The effect of CeO(2) and Fe(2)O(3) on optical and structural properties of zinc bismuth borate glass was investigated. From EPR and optical studies it is observed that iron ions are present in trivalent state with distorted octahedral symmetry. The cerium is present in Ce(4+) state. Upon 400 nm excitation the emission at 548 and 652 nm are attributed to the Bi(2+) species. The emission at 804 nm upon 530 nm excitation suggests that Bi(+) ions are present in the sample. It is interesting to observe that the optical band gap energy (E(opt)) decreases with the increase of transition metal and rare-earth ion doping. (C) 2009 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Optical materials; Electron paramagnetic resonance; Optical spectroscopy; Luminescence
Subjects:	Glass
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Feb 2012 07:50
Last Modified:	27 Mar 2012 11:05
URI:	http://cgcri.csircentral.net/id/eprint/911

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