| 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 |