Table 1. Lattices Parameters and atomic coordinates of α-, β-, γ-, and δ- phase at 0, 3.4, 9.4, and 66.2 GPa,respectively.

	Lattice Parameters (Å)	Atoms	x	y	z
α-phase	a = 3.944 (3.934a)	Mg(2b)	0.0	0.0	0.5
0 GPa	b = 3.944 (3.934a)	C(4f)	0.1123	0.1123	0.0
	c = 5.008 (5.021a)
β-phase	a = 3.183	Mg(4c)	0.0	0.1658	0.250
3.4 GPa	b = 8.536	C(8f)	0.000	0.4286	0.0911
	c = 4.410
γ-phase	a = 8.321	Mg(4i)	0.0549	0.0	0.7096
9.4 GPa	b = 2.609	C1(4i)	0.6145	0.0	0.2407
	c = 9.876	C2 (4i)	0.0626	0.0	0.1217
δ-phase	a = 2.525	Mg(1b)	0.0	0.0	0.500
66.2 GPa	b = 2.525	C(2d)	0.6667	0.3333	0.0718
	c  = 3.623