Table 2.

The calculated elastic tensor, C_ij (GPa) and corresponding eigenvalues, λ (GPa) of NaSbS₂ polymorphs.

NaSbS2 Polymorphs	Cij	1	2	3	4	5	6	Eigenvalue, λ
Monoclinic	1	40.52	7.62	18.06	0.00	3.61	0.00	12.35
	2	7.62	40.51	10.75	0.00	−0.10	0.00	17.93
	3	18.06	10.75	85.18	0.00	11.09	0.00	21.98
	4	0.00	0.00	0.00	15.09	0.00	−4.34	32.01
	5	3.61	−0.10	11.09	0.00	19.99	0.00	40.03
	6	0.00	0.00	0.00	−4.34	0.00	19.24	96.25
Trigonal	1	97.81	25.17	23.54	10.84	0.00	0.00	21.98
	2	25.17	97.81	23.54	−10.84	0.00	0.00	25.22
	3	23.54	23.54	55.54	0.00	0.00	0.00	41.87
	4	10.84	−10.84	0.00	30.18	0.00	0.00	44.52
	5	0.00	0.00	0.00	0.00	30.18	10.84	77.60
	6	0.00	0.00	0.00	0.00	10.84	36.32	136.64
Triclinic	1	32.83	7.55	12.22	3.51	−0.28	2.43	11.29
	2	7.55	31.22	10.08	−3.08	2.13	1.88	11.83
	3	12.22	10.08	81.83	3.53	4.89	3.90	16.94
	4	3.51	−3.08	3.53	14.20	1.43	1.45	26.31
	5	−0.28	2.13	4.89	1.43	14.85	2.36	34.50
	6	2.43	1.88	3.90	1.45	2.36	13.90	87.97