Germanium
Material
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Properties
Germanium
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| Optical Properties | |
|---|---|
| Transmission range in µm @10% min. | 1.8 - 24 |
| Transmission range in µm @50% min. | - |
| Refractive index @633nm | 4.10417 (4.0026 @11µm) |
| Reflection losses in % at 1 surface | 36.04 @10µm |
| Reflection losses in % at 2 surfaces | 53 @10.6µm |
| dn/dT in 1/K | 396 · 10-6 |
| Physical Properties | |
|---|---|
| Density in g/cm³ | 5.327 |
| Melting point in °C | 938.25 |
| Specific heat capacity in J/(kg · K) | 310 |
| Thermal Conductivity in W/(m · K) | 58.61 |
| Thermal Expansion in 1/K | 5.9 · 10-6 @293K |
| Dielectric constant | 16.6 |
| Solubility in water in g/100g | unsoluble |
| Mohs hardness | 6 |
| Knoop hardness in kg/mm² | 800 |
| Material type | Single crystal, synthetic |
| Crystal type | cubic face-centered, diamond structure |
| Crystal structure | Fd3m |
| Lattice constant in Å | a = 5.62 |
| Elastic coeficients in GPa | C11 = 129 C12 = 48.3 C44 = 67.1 |
| Young's Modulus (E) in GPa | 102.7 |
| Shear Modulus (G) in GPa | 67 |
| Bulk Modulus (K) in GPa | 77.2 |
| Rupture Modulus in MPa | 110 |
| Apparent elastic limit in MPa | 8926 |
| Poisson ratio | 0.2 |
| Spectral Properties | |
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