Table 1.

Calculated elastic constants of some cubic and tetragonal carbon allotropes (GPa)

Structure	Diamond	T-carbon	T6	T12
C11	1,078.0	228	730.3	1,012.8
C33			1,164.5	1,001.7
C44	578.9	89	80.5	500.0
C66			68.3	607.9
C12	138.6	141	25.4	214.1
C13			88.8	152.7
B0	451.7	169	336.8	451.8
G0	535.2	70	196.6	422.1