Table 1.

Independent elastic constants, bulk, shear, and Young’s moduli (all in GPa) of stable phases of CaC₂

Space group	P	c11	c22	c33	c44	c55	c66	c12	c13	c23	c15	c25	c35	c46	B	G	E
C2/m	0	86	98	91	13	47	6	29	58	22	7	9	−21	5	55	24	63
Cmcm	4	158	188	317	70	72	48	43	68	78					115	70	174
Immm	15.2	338	650	397	162	79	86	64	59	71					197	145	349
P6/mmm	105.8	1,056		824	373		458	141	238						463	396	924