Surperhard monoclinic BC6N allotropes: First-principles investigations
Qu Nian-Rui1, Wang Hong-Chao1, Li Qing1, Li Yi-Ding1, Li Zhi-Ping1, †, Gou Hui-Yang2, Gao Fa-Ming1, ‡
       

The phonon-dispersion curves of (a) Cm-BC6N and (b)Pm-BC6N at 0 GPa.