| Property | Value | |
| Hardness* | 10,000 kg/mm2 | |
|
Strength, tensile
|
>1.2 GPa | |
| Sound velocity* | 17,500 m/s | |
| Density | 3.52 g/cm3 | |
| Atom density* | 1.77 x 1023 1/cm3 | |
| Young’s modulus* | 1140 GPa | |
| Poisson’s ratio | 0.069 | |
| Thermal expansion coefficient | 1.1 ppm/K | |
| Thermal conductivity* | 20.0 W/cmK | |
| Debye temperature* | 2,220 K | |
| Refractive index | 2.41 | |
| Optical transparency | UV to far IR |
|
| Loss tangent at 140 GHz | < 10-5 | |
| Dielectric constant | 5.7 | |
| Dielectric strength | 10,000,000 V/cm | |
| Electron mobility | 2,200 cm2/Vs | |
| Hole mobility | 1,600 cm2/Vs | |
| Bandgap | 5.45 eV | |
| Resistivity | 1013 – 1016 Wcm | |
| *highest value of all solid materials | ||
| Thermal properties | Thermal conductivity 800-1800 w/mK, tailored to the application. Measured through-thickness at 20 degrees C.Thermal expansion 1.0 ppm/K at 20*C 1.6 ppm/K at 100*C 2.3 ppm/K at 200*C 3.5 ppm/K at 400*C |
| Mechanical properties | Fracture strength 800 MPa at 200 um thickness 400 MPa at 800 um thickness |
| Optical properties | Optical absorption < 0.04 cm-1 (10.6 um)Optical scattering < 0.8 % (633 nm, BDTF 2*-80*) |
| Dielectric properties | Loss tangent tan d = 1-2 10-5 at 140 GHz |