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Products › Materials › Cadmium Telluride (CdTe)
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Cadmium Telluride (CdTe) |
Cadmium Telluride can be used for spectroscopy and where deep IR transmission is required. It is relatively workable and offers transmission to >20 microns.
CdTe has some application for solar cells. |
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Product Data |
| Transmission Range : |
0.85 to > 20 micron (1)(3) |
| Refractive Index : |
2.653 @ 10 microns (1) |
| Reflection Loss : |
32% @ 10 microns |
| Absorption Coefficient : |
n/a |
| Reststrahlen Peak : |
n/a |
| dn/dT : |
5.0 x 10-5 K-1 |
| dn/dμ = 0 : |
n/a |
| Density : |
6.2 g cm-3 (2) |
| Melting Point : |
1092 °C |
| Thermal Conductivity : |
6.2 W.m-1.K-1 at 293 K |
| Thermal Expansion : |
5.9x10-6 K-1 at 293 K |
| Hardness : |
Knoop 45 (3) |
| Specific Heat Capacity : |
210 J.kg-1.K-1 at 293 K |
| Dielectric Constant : |
11 @ 1MHz |
| Youngs Modulus (E) : |
36.52 GPa |
| Shear Modulus (G) : |
n/a |
| Bulk Modulus (K) : |
25 GPa |
| Elastic Coefficients : |
C11=53.51; C12=36.81; C44=19.94 |
| Apparent Elastic Limit : |
5.9 MPa (3) |
| Poisson Ratio : |
0.41 |
| Solubility : |
Insoluble in water |
| Molecular Weight : |
240.02 |
| Class/Structure : |
Cubic ZnS (110) cleavage |
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.
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Refractive Index |
| µm |
No |
µm |
No |
µm |
No |
| 0.8 |
2.876 |
1.0 |
2.840 |
2.0 |
2.713 |
| 2.5 |
2.702 |
3.0 |
2.695 |
3.5 |
2.691 |
| 4.0 |
2.6807 |
5.0 |
2.684 |
6.0 |
2.681 |
| 7.0 |
2.679 |
8.0 |
2.677 |
10.0 |
2.653 |
| 12.5 |
2.646 |
15.5 |
2.6407 |
20.0 |
2.614 |
| 22.2 |
2.601 |
24.8 |
2.5801 |
26.32 |
2.570 |
| 27.03 |
2.564 |
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Product Notes |
CdTe is rarely used because of its toxicity. The finished optics are not particularly hazardous but should be handled with care. However, difficulties with processing cadmium compounds means that very few optical companies will cut and polish the material. Crystran Ltd does NOT supply CdTe. This data is provided for reference only.
A form of CdTe was originally utilised as the obsolete Kodak designation of IRTRAN-6
CAUTION: Cadmium salts are TOXIC and should be handled with care.
REFERENCES:
(1) Handbook Optical Constants, ed Palik, V1, ISBN 0-12-544420-6
(2) NIST USA data
(3) Hawkins, Sherwood, Djotni: Mid IR Filters for astronomical and remote sensing instrumentation. Invited Paper SPIE Conference Glasgow 2008
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Data provided is extracted from our technical handbook of materials. While every attempt has been made to verify the source of the information, Crystran Ltd accept no responsibility for accuracy of data |
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