Table of Contents
ISRN Optics
Volume 2012, Article ID 193185, 7 pages
http://dx.doi.org/10.5402/2012/193185
Research Article

Effect of Stepwise Replacement of LiF by Bi2O3 and of Annealing on Optical Properties of LiFโ‹…B2O3 Glasses

1Department of Physics, Maharshi Dayanand University, Rohtakโ€‰124 001, India
2Department of Electronic Science, Kurukshetra University, Kurukshetraโ€‰136 119, India

Received 29 December 2011; Accepted 29 January 2012

Academic Editors: M. Farries, L. R. P. Kassab, and Y. Tsuji

Copyright © 2012 Susheel Arora et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Bismuth fluoroborate glasses with compositions ๐‘ฅBi2O3โ‹…(40โˆ’๐‘ฅ)LiFโ‹…60B2O3(๐‘ฅ=0,5,10,15,and20) are synthesized by melt-quench method. Optical characterization was carried out to examine variation of optical band gap energy (๐ธ๐‘”) and Urbach energy (๐ธ๐‘ˆ) with respect to the concentration. It reflects the effect of stepwise replacement of non-oxide and less polarizable LiF by an oxide and more polarizable (Bi2O3) group on the optical properties of the samples. The value of ๐ธ๐‘” decreases with increase in concentration of Bi2O3. The samples were subjected to annealing at different temperatures (300ยฐC, 350ยฐC, and 400ยฐC), and the effect of annealing on the optical properties of various samples was again studied. Annealing affects remarkably the values of ๐ธ๐‘” and ๐ธ๐‘ˆ in the samples with ๐‘ฅ=0.