Germanium (Ge)
| Properties (Ge) | |
| Transmission_Range | 1.8 - 23 µm |
| Refractive Index | 4.0034 @9.72 µm |
| Reflective Loss | 52.9% @10 µm |
| Reststrahlen | |
| Density | 5.327 g/cm3 |
| Melting Point | 937.4°C |
| Molecular Weight | 72.59 |
| Thermal Conductivity | 58.61 W/(m·K) |
| Specific Heat | 310 J/(kg·K) @0°...100°C |
| Thermal Expansion | 5.5 · 10-6/°C, 6.1 · 10-6 /°C |
| Hardness (Mohs) | 780 |
| Young`s Modulus | 102.7 <100>, 155.3 <111> GPa |
| Shear Modulus | 67 <100> GPa |
| Bulk Modulus | 77.2 GPa |
| Rupture Modulus | 93 MPa |
| Elastic Coefficient | C11 = 129; C12 = 48.3; C44 = 67.1 GPa |
| Dielectric Constant | 16.6 @f = 9.37 GHz |
| Solubility in Water | insoluble |
| Type of Material | single crystal, synthetic |
| Crystal Structure | cubic, diamond structure, m3m, a = 5,65754 Å |
| Cleavage Planes | (111), not perfect |
| Standard Diameter | up to 300 mm |
| Application | lenses, band pass filters, thermography, ATR Crystals |
| Remarks |
Transmission spectrum
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This symbol denotes crystal grown in-house.