IR-spectral study of the effect of WO3 on the structure of tellurite glasses

The comparison of IR-spectra of tellurite glasses and their crystal products containing from 5 up to 45 mol% WO₃ indicates that the modifier does not change the coordination of tellurium. The IR-spectra of glasses containing small WO₃ amounts show a band at 925 cm^?1, which shifts up to 950 cm^?1 with the increase in the tungsten concentration. The effect is specific of the vitreous state and may be explained by the change in the coordination of tungsten.