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, ‡
       

Structures of (a) Cm-BC6N and (b) Pm-BC6N; the yellow, orange, and green spheres represent B, C, and N atoms, respectively.