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Raman spectroscopy study of high B2O3 content lead fluoroborate glasses

✍ Scribed by A. G. Souza Filho; I. Guedes; P. T. C. Freire; J. Mendes Filho; M. C. C. Custódio; R. M. Lebullenger; A. C. Hernandes

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
115 KB
Volume
30
Category
Article
ISSN
0377-0486

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✦ Synopsis

Several compositions in the (50x ) PbO-xPbF 2 -50B 2 O 3 (0 Ä x Ä 20) mol% vitreous system were systematically characterized at room temperature by infrared and Raman microscopic analysis. A general assignment of the vibrations observed for x = 0 mol% was proposed on the basis of borate units and correlations with other lead borate glass systems. By observing the behavior of these vibrations as a function of PbF 2 content. It was verified that the effect of the addition of fluorine ions to the glass network is twofold, namely; (i) the destruction of PbO 4 pyramids and (ii) the conversion of threefold to fourfold coordinated boron atoms.

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