Table 1.

The calculated and the available theoretical and experimental values of elastic constants C _ij (GPa), bulk modulus B (GPa), shear modulus G (GPa), Young’s modulus Y (GPa), Pugh’s ratio B/G and Poisson ratio υ of cubic perovskites CsBX₃ (B = Pb, Sn, Ge; X = I, Br, Cl).

Phase	C 11	C 12	C 44	B	G	Y	B/G	v	References
CsPbI3	34.23	4.46	3.24	14.38	6.30	14.49	2.283	0.32	This Work
				23					Cal.21
				19.8					Cal.22
				14.4					Cal.23
					7.9	20.1	2.544	0.33	Exp.24
CsPbBr3	42.32	6.51	4.24	18.45	7.90	20.74	2.335	0.31	This Work
				27					Cal.21
				23.5					Cal.22
CsPbCl3	48.97	7.83	5.08	21.54	9.27	24.32	2.324	0.31	This Work
	46.04	6.10	4.91	22.59	8.98	23.34	2.16	0.30	Cal.19
				31					Cal.21
				25.8					Cal.22
CsSnI3	21.34	1.22	5.74	6.30	7.55	16.18	0.83	0.07	This Work
CsSnBr3	43.89	6.69	5.21	19.09	8.94	23.19	2.135	0.30	This Work
	44.65	3.93	6.57	17.50	10.55			0.08	Cal.20
CsSnCl3	50.66	8.71	6.01	22.70	10.20	26.61	2.221	0.30	This Work
CsGeI3	40.32	8.18	8.87	18.89	11.28	28.22	1.674	0.25	This Work
CsGeBr3	48.08	10.82	10.07	23.24	12.92	32.70	1.799	0.27	This Work
	49.52	11.63	11.52	24.26	14.08			0.19	Cal.20
CsGeCl3	54.93	13.08	11.99	27.03	15.02	38.02	1.800	0.27	This Work