透射鏡片材料 — Germanium (Ge) 鍺
| Transmission Range | 1.85 – 23 μm (thickness 2 mm) |
| Refractive Index | 4.104147 @633nm |
| Reflection Loss | 36.04% @10 μm |
| Density | 5.327 g/cm3 |
| Melting point | 938.25°C |
| Molecular Weight | 72.59 |
| Thermal Conductivity | 58.61 W/(m·K) |
| Spec. Heat Capacity | 310 J/(kg·K) (@0°…100°C) |
| Thermal Expansion | 5.9 · 10-6/K @293K |
| Hardness (Mohs) | 800 |
| Young’s Modulus | 102.7 <100>? GPa |
| Shear Modulus | 67 GPa <100> nbsp] |
| Bulk Modulus | 77.2 GPa |
| Fracture Modulus | 110 MPa |
| Elastic Coefficient | C11?= 129; C12?= 48.3; C44?= 67.1 GPa |
| Dielectric Constant | 16.6 @f = 9.37 GHz |
| Solubility in Water | insoluble |
| Crystal Structure | single crystal, synthetic |
| Crystal Type | cubic, diamond structure, a = 5.62 ? |
| Cleavage Planes | (111), not perfect |
| Poisson Ratio | 0.2 |
| Application | lenses, band pass filters, thermography, ATR Crystals, IR optics |
