透射鏡片材料 — 氟化鋇Barium Fluoride (BaF2)
| Transmission Range | 0.14 – 14 (thickness 2mm)?μm |
| Refractive Index | 1.47326 @633 nm |
| Reflection Loss | 3.4% @4 μm; |
| Residual Beam Wavelength | 47 μm |
| Density | 4.89 g/cm3 |
| Melting point | 1368°C |
| Molecular Weight | 175.36 |
| Thermal Conductivity | 10.9 W/(m·K) @305K |
| Spec. Heat Capacity | 410 J/(kg·K) |
| Thermal Expansion | 18.4 · 10-6/K (273-573K) |
| Hardness (Mohs) | 82 (load 500g) |
| Young’s Modulus | 53.07 GPa |
| Shear Modulus | 25.4 GPa |
| Bulk Modulus | 57.8 GPa |
| Fracture Modulus | 26.9 MPa |
| Elastic Coefficient | C11?= 91; C12?= 41.2; C44?= 25.3 GPa |
| Dielectric Constant | 7.33 @f = 2 MHz |
| Solubility in Water | 0.16 g/100g @25°C |
| Crystal Structure | single crystal, synthetic |
| Crystal Type | cubic, CaF2 type structure, a=6.2? |
| Cleavage Planes | (111) |
| Poisson Ratio | 0.31 |
| Application | Scintillator, IR optics |
