Resource
Si (Silicon)
Physical and optical properties
Transmission Range : |
1.2 to 15 μm (1) |
Refractive Index : |
3.4223 @ 5 μm (1) (2) |
Reflection Loss : |
46.2% at 5 μm (2 surfaces) |
Absorption Coefficient : |
0.01 cm-1 at 3 μm |
Reststrahlen Peak : |
n/a |
dn/dT : |
160 x 10-6 /°C (3) |
dn/dμ = 0 : |
10.4 μm |
Density : |
2.33 g/cc |
Melting Point : |
1420 °C |
Thermal Conductivity : |
163.3 W m-1 K-1 at 273 K |
Thermal Expansion : |
2.6 x 10-6 / at 20°C |
Hardness : |
Knoop 1150 |
Specific Heat Capacity : |
703 J Kg-1 K-1 |
Dielectric Constant : |
13 at 10 GHz |
Youngs Modulus (E) : |
131 GPa (4) |
Shear Modulus (G) : |
79.9 GPa (4) |
Bulk Modulus (K) : |
102 GPa |
Elastic Coefficients : |
C11=167; C12=65; C44=80 (4) |
Apparent Elastic Limit : |
124.1MPa (18000 psi) |
Poisson Ratio : |
0.266 (4) |
Solubility : |
Insoluble in Water |
Molecular Weight : |
28.09 |
Class/Structure : |
Cubic diamond, Fd3m |
Refractive Index
No = Ordinary Ray
µm |
No |
µm |
No |
µm |
No |
1.357 |
3.4975 |
1.367 |
3.4962 |
1.395 |
3.4929 |
1.5295 |
3.4795 |
1.660 |
3.4696 |
1.709 |
3.4664 |
1.813 |
3.4608 |
1.970 |
3.4537 |
2.153 |
3.4476 |
2.325 |
3.4430 |
2.714 |
3.4358 |
3.000 |
3.4320 |
3.303 |
3.430 |
3.500 |
3.4284 |
4.000 |
3.4257 |
4.258 |
3.4245 |
4.500 |
3.4236 |
5.000 |
3.4223 |
5.500 |
3.4213 |
6.000 |
3.4202 |
6.500 |
3.4195 |
7.000 |
3.4189 |
7.500 |
3.4186 |
8.000 |
3.4184 |
8.500 |
3.4182 |
10.00 |
3.4179 |
10.50 |
3.4178 |
11.04 |
3.4176 |
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Product Notes