Data
Character table：
| TiN | ZrN | NbN | TaN | Cr2N | VN | |
|---|---|---|---|---|---|---|
| Nitrogen content[%] | 22.63 | 13.31 | 13.10 | 7.19 | 11.87 | 21.56 |
| Crystal structure | Cubic | Cubic | Hexagonal | Hexagonal | Hexagonal | Cubic |
| Lattice periods,kx. a | 4.249 | 4.537 | 2.959 | 2.933 | 4.806 | 4.136 |
| c | 11.271 | 2.864 | 4.479 | |||
| c/a | 3.804 | 0.98 | 0.928 | |||
| Density[g/cm3] calculated |
5.44 | 7.35 | 8.305 | 14.36 | 6.51 | 6.102 |
| experimental | 5.43 | 7.09 | 8.40 | 13.80 | 6.04 | |
| Microhardness 100g [kg/mm2] |
2050 | 1670 | 1461 | 1060 | 1571 | 1310 |
| Melting Point[℃] | 2950 | 2980 | 2300 | 3087 | 1650(分解） | 2050 |
| Heat of formation ΔH°(298）[Kcal/mol] |
-80.4 | -87.3 | -56.8±1.5 | -59.0 | -25.2 | -60.0 |
| Entropy S°(298) [Kcal/mol・℃] |
7.24±0.1 | 9.3±0.1 | 10.5±0.2 | 12.2±1.0 | 18.0±2.0 | 8.9±0.1 |
| Specific electrical resistance[μΩ・cm] at 20℃ |
40 | 18 | 54 | 198 | 84 | 60 |
| Point of transition to superconductivity °K |
5.6 | 9.8 | <1.94 | <4.2 | 8.2 |
(Reference) Hand book refractory compounds (metallurgiya in Moscow 1976 editions)
