The calculated and experimental elastic constants (GPa), bulk modulus (GPa), shear modulus (GPa), Young' modulus (GPa), and Possion's ratio of S, T1, σ and Al.

Table 3: The calculated and experimental elastic constants $C_{i j}$ (GPa), bulk modulus $B$ (GPa), shear modulus $G$ (GPa), Young' modulus $E$ (GPa), and Possion's ratio $ν$ of S, T₁, σ and Al.

	S		T1	σ	Al
	TW	Cal [5]	TW	TW	TW	Cal [23]	Exp
$C_{11}$	129.8	115.9	174.2	195.7	120.1	106.1	124
$C_{12}$	42.4	35.3	73.8	77	62.3	68.6	61.9
$C_{13}$	54.9	46.8	32.9	-	-	-	-
$C_{22}$	175.2	174.1	-	-	-	-	-
$C_{23}$	37.2	38.7	-	-	-	-	-
$C_{33}$	132.7	153.1	156.7	-	-	-	-
$C_{44}$	47.9	50.9	21.6	57.2	34.3	33.6	31.6
$C_{55}$	70.7	70.2	-	-	-	-	-
$C_{66}$	36.6	26.6	50.2	-	-	-	-
$B_{V}$	78.5	78.5	87.1	-	-	-	-
$B_{R}$	78	74.4	85.4	-	-	-	-
$B$	78.3	75.2	86.3	116.6	81.6	81.1	82.6
$G_{V}$	51.2	51	43	-	-	-	-
$G_{R}$	59.2	45.1	37.4	-	-	-	-
$G$	55.2	48.1	40.2	58.1	32	26.6	31.4
$E$	134.1	118.9	104.4	149.4	85	71.9	83.6
$G / B$	0.71	0.64	0.47	0.5	0.39	0.33	0.39
$ν$	0.21	0.24	0.3	0.29	0.33	0.35	0.33