Larger dispersion of values is noted for shear moduli. The highest shear modulus is found for C 16 , i.e. G V (C 16 ) = 512 GPa, while lower values, closer to the corresponding bulk modulus are found for the binary compounds. The B V and G V magnitudes for C 16 are comparable with the accepted values for diamond . Regarding the binary compounds, B V and G V were found close to literature values for dense BN and C 3 N 4 .