Abstract
Raman and FT-IR studies are reported for the (1 − x)TeO 2 xMgO system where 0.05 < x < 0.40. The destruction of the three-dimensional TeO 4 chain network with increase in MgO concentration is followed by comparing the intensities of the TeO 3 and TeO 4 stretching-mode bands in the 700 cm −1 spectral region. Examination of the same systems after recrystallization yields spectra in which the basic contour often resembles the band envelope of the initial glasses. The decomposition of the Boson peak and its shoulder leads to the suggestion that the strongest feature in the band mass can always be assigned to the long-range descriptive element but the broad shoulder seems to be related to modes associated with more medium-range external interactions within the polyhedron latticework.
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