C. Duverger et al., LOW-FREQUENCY RAMAN-SPECTRA AND STRUCTURAL CORRELATIONS IN METAL-OXIDE GLASSES, Journal of molecular structure, 410, 1997, pp. 285-289
Raman and FT-IR studies are reported for the (1 - x)TeO2-xMgO system w
here 0.05 < x < 0.40. The destruction of the three-dimensional TeO4 ch
ain network with increase in MgO concentration is followed by comparin
g the intensities of the TeO3 and TeO4 stretching-mode bands in the 70
0 cm(-1) spectral region. Examination of the same systems after recrys
tallization yields spectra in which the basic contour often resembles
the band envelope of the initial glasses. The decomposition of the Bos
on peak and its shoulder leads to the suggestion that the strongest fe
ature in the band mass can always be assigned to the long-range descri
ptive element but the broad shoulder seems to be related to modes asso
ciated with more medium-range external interactions within the polyhed
ron latticework. (C) 1997 Elsevier Science B.V.