Elastic Constants and Elastic Moduli of Silicon Carbide Nanosheet

۲-Dmensional silicon carbide (۲D SiC) provides several advantages compared to the bulk silicon carbide, due to its two-dimensional structure. Elastic constants and elastic moduli of ۲D carbide nanotubes were calculated employing density functional theory (DFT). There are six independent elastic constants for tetragonal lattice with (۴۲۲, ۴mm, -۴۲/m, ۴/mmm) point group. The calculated , , , , ,  of ۲D SiC are reported in this work. The results suggest that the shear modulus of ۲D SiC is ۲۷.۷۸ GPa, which is lower than that of the of single layered graphene sheet (=۰.۲۲ TPa). The bulk modulus of ۲D SiC is ۴۴.۹۸ GPa as well. Moreover, Young’s modulus of ۲D SiC is lower than Young’s modulus of single layered graphene sheet. Compared to Young’s modulus of the amorphous phase of the SiC (=۳۱۳.۶ GPa), Young’s modulus of ۲D SiC (=۱۵۶.۱۹ GPa) is smaller. The main reason is that the stiffness of the ۲D SiC in the x direction is smaller than the stiffness of the bulk SiC.

Keywords:

۲D silicon carbide , DFT , Elastics constants , Mechanical properties