Abstract
Raman and far-IR spectra have been obtained up to ca. 45 kbar [4.5 GPa] for paratellurite (Te0 2) in a diamond anvil cell. At the D 4 4 to D 2 4 phase transition ca. 9 kbar an E symmetry mode initially at 122cm −1 was found to split into two components in both IR and Raman spectra: their coincidence in both types of spectra shows that one component in the Raman spectrum cannot be an LO mode. No other E modes were seen to split. A further phase transition claimed ca. 30 kbar was not confirmed. Paratellurite is exceptionally sensitive to the presence of non-hydrostatic stresses, which greatly influence the phonon frequencies. This behaviour is illustrated by Raman spectra obtained under varying degrees of shear stress.
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