Ab initio elastic constants for the lonsdaleite phases of C, Si and Ge

Abstract

The elastic constants of lonsdaleite C, Si and Ge are calculated by using theplane-wave pseudopotential method in the scheme of density functional theoryand the local density approximation. For comparison, the elastic constants of thecubic diamond phases of these elements, zincblende SiC and 6H–SiC, are alsocalculated.