C11

C22

C33

C44

C55

C66

C12

C13

C23

β-Si3N4

443.6

443.6

542.4

129.6

129.6

145.9

151.8

104.4

104.4

β-C3N4

894.3

894.3

1057.2

310.1

310.1

349.8

194.6

111.9

111.9