Normal Vibrations of Two Polymorphic forms of TeO<sub>2</sub> Crystals and Assignments of Raman Peaks of Pure TeO<sub>2</sub> Glass

Abstract

Listen

Translate article

Raman spectra of paratellurite, tellurite and pure TeO2 glass were measured. The normal vibration of paratellurite and tellurite was analyzed. The spectrum of pure TeO2 glass were deconvoluted into symmetric Gaussian functions. The normal vibrations of paratellurite are exactly described as combined representations of movement of oxygen atom in Te-eqOax-Te linkage and vibrations of TeO4 trigonal bipyramid (tbp). Compared the resolved Raman peaks of pure TeO2 glass with normal vibration of paratellurite, all Raman peaks from 420 to 880cm-1 are assigned to the vibrations of TeO4 tbp and Te-eqOax-Te linkage. The antisymmetric stretching vibrations of Te-eqOax-Te linkage have relatively large intensities to symmetric stretching vibrations of Te-eqOax-Te linkage. In pure TeO2 glass, TeO4 tbps are formed by most of tellurium atoms and connected at vertices by the Te-eqOax-Te linkages.