Data

Character table:

Carbide 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)

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