The mechanical stability criteria were obtained from the elastic constants calculations. The treatment of the results was done using ELATE online tool devoted to the analysis of the elastic tensors . The program provides the bulk (B), shear (G) and Young's (E) moduli along different averaging methods; the Voigt method was used here. Two empirical models, Mazhnik-Oganov and Chen-Niu , were used to estimate the Vickers hardness (H V ) from the elastic constants.