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Diamond - Cubic Carbon (C)

Diamond - Cubic Carbon (C) Data Sheet     ♦ Diamond - Cubic Carbon (C) MSDS

Diamond is used for transmission windows and domes, and offers a very wide transmission range. Type IIa is the hardest material available and has the highest thermal conductivity.

Transmission Range :300nm to 2.5 μm 7 to >100 μm (1)
Refractive Index :2.4175 @ 0.589 μm (1)
Reflection Loss :30% @ 0.589 μm
Absorption Coefficient :<0.07 cm-1 @ 8 to 12 μm
Reststrahlen Peak :n/a
dn/dT :9.6 x 10-6 /°C (3)
dn/dμ = 0 :n/a
Density :3.51
Melting Point :3497°C
Thermal Conductivity :2600 W m-1 K-1 @ 273K (2)
Thermal Expansion :0.8 x 10-6 /°C at 293K
Hardness :Knoop 5700 to 10400
Specific Heat Capacity :500 J Kg-1 K-1 (4)
Dielectric Constant :5.68 @ 1.68Mhz at 300K (2)
Youngs Modulus (E) :1050 GPa
Shear Modulus (G) :n/a
Bulk Modulus (K) :442 GPa
Elastic Coefficients :C11=1076; C12=125; C44=577
Apparent Elastic Limit :276 MPa
Poisson Ratio :0.16 to 0.29
Solubility :Insoluble in water
Molecular Weight :12.01
Class/Structure :Cubic Diamond, Fd3m

To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page.  To expand the transmission graphs, please click on the image.


µm   Noµm   Noµm   No
0.232   2.69170.298   2.5429.405   2.4626
0.589   2.41750.656   2.41041.00   2.3905
2.0   2.38133.0   2.37954.0   2.3787
5.0   2.37836.0   2.377910.0   2.3765
20   2.3741

Diamond is available as single crystal (Type IIa) natural or synthetic or as polycrystalline CVD film. Single crystal is available economically up to about 4mm diameter. CVD diamond of 75mm diameter is available.

The IR transmission has a range of absorptions in the mid-IR between 2,5 and 7 microns due to inherent lattice resonances. The UV transmission may be limited to 350nm in poorer quality samples.

Single crystal diamond is selected into four forms:
Ia ~98% of natural yield (>100ppm Nitrogen - yellow)
Ib ~0.1% of natural yield (~100ppm Nitrogen)
IIa ~2% of natural yield (1ppm Nitrogen)
IIb - Synthetic only (100ppm boron for electronic applications)

Only Type IIa is used for optical applications. CVD diamond transmission and characteristics are very similar to Type IIa.

REFERENCES:
(1) Handbook Optical Constants, ed Palik, V1, ISBN 0-12-544420-6
(2) Properties of Bulk Polycrystalline Diamond, Sussmann et. al. Diamond & Rel. Mat. 3(1994) 303-312
(3) Fontenella et. al. App. Optics 16, 2949 (1977)
(4) Slack & Bartram J.Appl. Phys. 46, 89 (1975)