The electronic band structures of the new boron nitrides were calculated using the all-electrons DFT-based augmented spherical wave method (ASW) method using the crystal structure data from Table . The results are shown in Fig. . The bands (blue lines) develop along the main directions of the respective tetragonal and hexagonal Brillouin zones. The zero energy along the vertical axis is considered with respect to the Fermi level E F . For both B 2 N 3 polymorphs (Figs. and), bands cross the Fermi level with a tendency toward a weakly metallic behavior.