General Properties of Cvd Diamond

Improve production performance and lower processing costs with our line of CVD diamond products that are engineered to the application. DDK grows and processes CVD diamond film for thermal and wear part applications.

Property Value
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
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