To verify the dynamic stability of the new B-N phases, an analysis of their phonon properties was performed. The phonon band structures obtained from a high resolution of the tetragonal and hexagonal Brillouin zones in accordance with the method proposed by Togo et al. are presented in Fig. . The bands (red lines) develop along the main directions of the tetragonal (or hexagonal) Brillouin zone (horizontal x-axis), separated by vertical lines for enhanced visualization, while the vertical direction (y-axis) represents the frequencies ω, given in terahertz (THz).