Formula Si
Growth method Czochalski technique
Max. sizes, (mm) Ø150
Transmission range, (µm)
(Thickness 2 mm)
1.2 – 15.0
Structure Cubic
Density (g/cm3) 2.329
Melting point (°C) 1410
Hardness (Mohs) 7
Thermal expansion coefficient (10-6/K) 2.3
Thermal conductivity (W m-1 K-1) 147
Specific heat capacity (J kg-1K-1)
Solubility in water (g/100 cm3) 0.005
Solubility in acids Soluble
Solubility in organic solvents Insoluble
Wavelength (µm)
Refractive index
3.0
5.0
6.0
7.0
8.0
10.0
3.432
3.422
3.420
3.419
3.418
3.417
Absorption coefficient (cm-1) 0.01 at 5 µm

Silicon for IR-range