Stability of silicon carbide at high pressures
Goncharov A. F. , Yakovenko E. V. , Stishov S. M.
The effect of high pressures on the phonon spectrum of SiC along the Λ direction has been studied by Raman scattering and through the use of the universality of the dispersion curves of the SiC polymorphs. The frequency of the ТА vibrations has been found to decrease at the boundary of the Brillouin zone, indicating an approaching instability of the lattice. It is suggested that a structural phase transition occurs in SiC at Ρ > 1.5 Mbar.