RAMAN-SCATTERING IN TELLURIUM-METAL OXYDE GLASSES

Structural studies were undertaken of glasses in the (1-x)TeO2- xZnO s ystem. The glass domain (0,09 < x > 0,40) was verified and variations observed in the Raman spectra were correlated with changes induced on the TeO2 polyhedra upon glass formation with the addition of the metal oxyde. Spectra were recorded as these glasses were heated through T-c and recrystallized. The spectral profiles observed in the recrystalli zed systems closely resemble those of the broad bands in the initial g lasses. The sharp bands in the final spectra, characteristic of a more ordered phase, are interpreted (by correlation with neutron diffracti on data) on the basis of chains of TeO3-TeO4 polyhedra interlaced with chains of ZnO6 groups.