Mechanical anisotropy and electronic properties of X
2
N
2
(XH
2
): first-principles calculations
*
Xiao-Zhen Li(李小珍),Meng-Jiang Xing(邢孟江)
Figure 3.
The phonon spectra of C
2
N
2
(CH
2
) (a), Si
2
N
2
(SiH
2
) (b) and Ge
2
N
2
(GeH
2
) (c), respectively.