The preliminary computations consisted of calculating the structures of zb-BX to reproduce the experimental and theoretical findings. Table shows the calculated and available experimental lattice constants a of zb-BAs which are in good agreement. The zinc-blende structure is shown in Fig. in a ball-and-stick and tetrahedral representations. The latter shows that the tetrahedra are regular as in diamond, presenting the sp 3 -like 109.47° angle as mentioned above, with only B-As bonds. The observation is relevant in that the qtz topology is characterized by distorted tetrahedra.