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Abstract:
Raman spectra of ZnTe were measured under hydrostatic pressures
up to 15 GPa at T = 300 K. Results for the frequencies of
first- and second-order Raman features of the zincblende phase
(0-9.5 GPa) are used to set up a rigid-ion model of the phonon
dispersion relations under pressure. Calculated phonon
densities of states, mode Gruneisen parameters and the thermal
expansion coefficient as a function of pressure are discussed.
The effect of pressure on the widths and intensities of Raman
spectral features is considered. Raman spectra of high-pressure
phases of ZnTe are reported. These spectra indicate the
possible existence of a new phase near 13 GPa, intermediate
between the cinnabar and orthorhombic (Cmcm) phases of ZnTe.
