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 3D representations (left panel) and 2D projections (right panel) of Youngʼs moduli for (a) Cm-BC6N and (b) Pm-BC6N. Note that the negative sign only denotes the direction corresponding to the positive one.