Vibrational Spectra Of Rhombohedral Teo3 Compared To Those Of Reo3-Like Proto-Phase And Alpha-Teo2 (Paratellurite): Lattice Dynamic And Crystal Chemistry Aspects

Vibrational spectra of rhombohedral TeO3 (r-TeO3) are analyzed along with those of ReO3-like proto-phase (c-TeO3) and alpha-TeO2 (paratellurite), emphasizing their lattice dynamic and crystal chemistry aspects. It is shown that (1) r-TeO3 can be regarded as resulting from the condensation of a particular R-point soft phonon of c-TeO3; (2) the Raman spectra of r-TeO3 and alpha-TeO2 are indicative of the two fundamentally different (from the crystal chemistry point of view) types of crystalline oxides, namely, framework-type and island-type, respectively. Copyright (C) 2010 John Wiley & Sons, Ltd.