SiC up to 35 GPa: Eos,phonon dispersion curves and sum rule. polytypes 6H and 15R |
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| Authors: | E. V. Jakovenko A. F. Goncharov S. M. Stishov |
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| Affiliation: | Institute of Crystallography, USSR Acad of Sci , Moscow, USSR |
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| Abstract: | Abstract Lattice parameters for SiC-15R and phonon frequencies for SiC-15R and SiC-6H were investigated as function of pressure by X-ray single crystal analysis and first-order Raman scattering. Linear and bulk moduli and phonon Gruneisen parameters were obtained. Phonon dispersion curves plotted in the standard large zone reveal certain softening of the TA-branch at the zone boundary. The nature of the covalent systems stability is discussed in the light of the sum rule. |
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