Dynamics and structure of TeO2 polymorphs: model treatment of paratellurite and tellurite; Raman scattering evidence for new gamma- and delta-phases

The joint lattice-dynamical model study of the vibrational and elastic prop erties of paratellurite (alpha-TeO2) and tellurite (beta-TeO2) has been con ducted. Emphasis was laid on the crystal chemistry aspects of Raman spectra of these lattices. Results were used to interpret the Raman spectra of two new polymorphs (gamma and delta) of tellurium dioxide, and to clarify thei r relationships with the spectrum of pure TeO2 glass. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.