FormulaGe
Growth methodCzochralski technique
Max. sizes, (mm)Ø200
Transmission range, (µm)
(Thickness 10 mm)
2.0 – 18.0
Structurecubic
Density (g/cm3)5.33
Melting point (°C)937
Hardness (Mohs)6
Thermal expansion coefficient (10-6/K)5.1 -5.8
Thermal conductivity (W m-1 K-1)59.8
Specific heat capacity (J kg-1 K-1)310
Solubility in water (g/100 cm3)insoluble
Solubility in acidssoluble in mixture of HCl and HNO3 and in H2O2
Solubility in organic solventsinsoluble
Wavelength (µm)
Refractive index
2.0
5.0
8.0
10.0
11.0
15.0
4.1079
4.0153
4.0053
4.0040
4.0031
4.0017
Absorption coefficient (cm-1)0.02 at 10.6 µm

 

Germanium for IR-range