Data
Character table：
| WC | Mo2C | TiC | TaC | NbC | VC | ZrC | |
|---|---|---|---|---|---|---|---|
| Carbon content[%] (theoretical value) |
6.13 | 5.89 | 20.05 | 6.22 | 11.45 | 19.08 | 11.64 |
| Crystal structure | Hexagonal | Hexagonal | Face centerd cubic |
Face centerd cubic |
Face centerd cubic |
Cubic | Cubic |
| Lattice periods,kx. a | 2.906 | 2.997 | 4.3178 | 4.410 | 4.433 | 4.118 | 4.6828 |
| c | 2.837 | 4.727 | |||||
| c/a | 0.975 | 1.54 | |||||
| Density[g/cm3] calculated |
15.77 | 9.06 | 4.92 | 14.47 | 7.82 | 5.48 | 6.66 |
| experimental | 15.5-15.7 | 9.18 | 4.93 | 14.32 | 7.56 | 5.36 | 6.73 |
| Microhardness 100g [kg/mm2] |
1730 | 1479 | 2850-3200 (50g) | 1547 | 2055 | 2480 | 2950(50g) |
| Melting Point[℃] | 2600 | 2690±20 | 3250 | 3880±150 | 3500±125 | 2648 | 3530 |
| Heat of formation from the metal and carbon ΔH°(298） [Kcal/mol] |
-8.4±3.0 | -4.2 | -43.85 | -36.00 | -33.6±0.8 | -24.4±0.4 | -47.7±5.0 |
| Entropy S°(298) [Kcal/mol・℃] |
9.0±1.5 | 19.8±3.0 | 5.8±0.1 | 9.0±7.0 | 19.0±8.0 | 6.77±0.1 | 8.5±1.5 |
| Specific electrical resistance[μΩ・cm] at 20℃ |
19 | 71 | 61 | 22 | 44 | 78(25℃） | 49(25℃） |
| Point of transition to superconductivity °K |
2.5-4.2 | 2.9 | 11.15 | 7.6-9.5 | 10.1-10.5 | < 1.2 | < 1.2 |
(Reference) Hand book refractory compounds (metallurgiya in Moscow 1976 editions)
