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Detailed Program
Paper Number : GL-P10
Time Frame : 12:00~13:30
Presentation Date : Thursday, 27, November
Session Name : Glass & Opto-Electronic Materials
Session Chair 1# :
Session Chair 2# :
Raman Spectroscopic Study of the Structure of ZnO-Bi2O3-B2O3 Glasses
Shun TSUJI
Kansai University
Bismuth containing glasses are known to be high-refractive-index glasses for precision molding. These glasses, however, show yellow color due to the electronic transition from 6s to 6p of Bi3+ ions depending on their composition. Therefore, it is important to study the structure around Bi3+ ions which would affect the color of the glasses. In the present study, the structure around Bi3 + ions has been investigated in ZnO-Bi2O3-B2O3 glasses.
Raman spectra of xZnO-yBi2O3-(100-x-y)B2O3 glasses were measured with a Raman spectrometer by the backscattering arrangement. The sample position was adjusted to obtain the maximum Raman scattering intensity. The measured intensity was corrected for the effect of sample thicknesses, the effect of the solid angle of collected light and the effect of the surface reflection. The corrected intensity was reduced to the intensity per one-mole Bi atoms by dividing by the Bi atomic density.
A Raman band due to Bi3+ cation vibrations [1,2] was observed at ca. 150 cm-1, as shown in fig.1. The reduced intensity of the 150 cm-1 band increased with an increase in Bi2O3 content, as shown in fig.2. It was deduced that the 150 cm-1 band was related to Bi-O-Bi bond, since the probability of the formation of Bi-O-Bi bonds should increase with increasing Bi2O3 content. The peak position of the 150 cm-1 band shifted toward low wavenumbers with an increase in ZnO/B2O3 molar ratio. In bismuth borate binary crystals, the 150 cm-1 band shifts toward low wavenumbers with increasing number of Bi atoms which bond with an O atom [3-5]. The increase of the number of Bi atoms bonding to an oxygen atom implies the increase of the probability that the Bi-O-Bi linkages extend. Therefore it was deduced that the Bi-O-Bi linkages extend with increasing ZnO/B2O3. The extent of the peak shift in zinc bismuth borate glasses was smaller than that in lithium bismuth borate glasses, indicating that the ability of ZnO to extend Bi-O-Bi linkages was lower than that of Li2O.















References:
[1] A.E.Miller et al., J.Non-Cryst.Solids 99(1988) 289. [2] A.A.Kharlamov et al., J.Non-Cryst.Solids 202(1996)233. [3] A.A.Kaminskii et al.,Optics Commun. 206(2002)179. [4] A.V.Egorysheva et al.,Fizika Tverdogo Tela 43(2001)1590. [5] A.V.Egorysheva et al., Kristallografiya 50(2005) 127.
Acknowledgements :