Within the DFT an adequate computational framework is the academic Vienna Ab initio Simulation Package (VASP) which has already proven its validity for the B-C-N system . Built on plane waves, the package uses the projector augmented wave (PAW) method for the initial atomic potentials fed into the calculations. DFT exchangecorrelation effects were treated considering gradient electron density within the generalized gradient approximation (GGA) . Preliminary test calculations with -local spherical electronic density were discarded due to underestimated interatomic distances, and exaggerated elastic constants magnitudes due to its overbinding character.