Pressure Effect on the Elastic Properties of SiC Polytypes
The pressure dependences of the second-order elastic constants ij C and the velocity of sound in 3C-SiC and 2H-SiC crystals are calculated in the framework of the Keating model with the additional assumption that the central α and the noncentral β force constants are linear functions of external hydrostatic pressure. Grüneisen parameters for the different acoustic modes of 3C-SiC have been also calculated. The third –order elastic constants ijk C for 3C-SiC are determined from the dependences of ij C on the pressure.
Roberta Nipoti, Antonella Poggi and Andrea Scorzoni
S. Y. Davydov "Pressure Effect on the Elastic Properties of SiC Polytypes", Materials Science Forum, Vols. 483-485, pp. 303-306, 2005