General properties of diamond
|
| Property |
Value |
Units |
| Hardness |
10,000 |
kg/mm2 |
| Strength, tensile |
>1.2 |
Gpa |
| Strength, compressive |
>110 |
Gpa |
| Fracture strength |
400–800 |
MPa at < 1 mm thickness |
| Sound velocity |
18,000 |
m/sec |
| Density |
3.52 |
g/cm3 |
| Young's modulus |
1200 |
GPa |
| Poisson's ratio |
0.2 |
Dimensionless |
| Atomic density |
1.77 x 1023 |
atoms/cm3 |
| Thermal expansion coefficient |
1.1–5.0 (300-1300K) |
ppm/K |
| Thermal conductivity |
10–20 |
W/cm-K |
| Thermal shock parameter |
30,000,000 |
W/m |
| Coefficient of friction |
0.05 (dry) |
Dimensionless |
| Derbye temperature |
2,200 |
K |
| Optical index of refraction (at (591 nm) |
2.41 |
Dimensionless |
| Optical transmissivity range |
225 to far IR |
nm |
| Emissivity |
0.02–0.03 |
at 10 microns |
| Optical absorption coefficient |
0.05–0.3 |
at 10 microns |
| Loss tangent at 40 Hz |
0.0006 |
Dimensionless |
| Loss tangent at 140 GHz |
<10-5 |
Dimensionless |
| Dielectric constant |
5.7 |
Dimensionless |
| Dielectric strength |
10,000,000 |
V/cm |
| Electron mobility |
2,200 |
cm2/V-sec |
| Hole mobility |
1,600 |
cm2/V-sec |
| Electron saturated velocity |
27,000,000 |
cm/sec |
| Hole saturated velocity |
10,000,000 |
cm/sec |
| Work function |
small and negative |
On [111] surface |
| Bandgap |
5.45 |
eV |
| Resistivity |
1013 - 1016 |
Ohm-cm |
