| |
Natural |
CVD |
PCD |
Tungsten Carbide |
Sapphire |
SiN |
Si |
GaAs |
Cu |
cBN |
Ag |
| Thermal Conductivity W/m-K |
900-3200 |
1000-2000 |
400-650 |
70 |
25 |
25 |
150 |
44 |
400 |
1300 |
410 |
| |
|
|
|
|
|
|
|
|
|
|
| cal/mol-C |
2.15 |
|
|
|
0.06 |
|
|
|
0.91 |
|
0.99 |
| Electrical Resistivity ohm-cm |
>1016 |
|
|
|
|
|
|
|
1.7 x 10-6 |
|
|
Strength, Fracture
MPa |
2800 |
1000 |
550-1150 |
2000 |
430 |
830 |
130 |
|
|
|
|
Hardness
GPa |
80 |
70 |
49.8 |
17.9 |
|
|
|
|
|
|
|
Heat Capacity,
300K J/kg-K |
515.74 |
|
|
|
|
|
|
|
|
|
|
Coeff. Thermal Exp. x
106K-1 at 300K |
1.2 |
1.2 |
4.2 |
3.3 |
8 |
|
4.1 |
6.5 |
17 |
|
19 |
| Refractive Index |
2.42 |
2.38 |
|
|
1.77 |
|
3.4 |
3.75 |
|
2.12 |
|
Lattice Constant
cm |
3.57 x 10-8 |
|
|
|
|
|
|
|
|
|
|
Sound Velocity
105cm/sec |
18.21 |
|
15.85 |
6.7 |
|
|
|
|
|
|
|
Band Gap
eV |
7.0 |
|
|
|
|
|
2.5 |
0.81 |
|
|
|
| Dielectric Constant |
5.7 |
5.7 |
|
|
|
|
11.7 |
10.9 |
|
7.1 |
|
| Loss Tangent |
|
< 4 x 10-4 |
|
|
|
|
|
|
|
|
|
Dielectric Strength
105 V/cm |
100 |
100 |
|
|
|
|
3 |
4 |
|
|
|
|
|
