Barium fluoride, BaF2, crystal has good transmittance over a wide spectrum range, from 150 nm to 12.5 um. It has been widely used as windows, lenses, and prisms, particularly for ultaviolet transmittance.
| Diameter | Monocrystalline<150m mPolycrystalline<350mm |
| Orientation | 111, 110, 100 direction |
| Density,g/cm3 | 4.83 |
| Lattice constant(nm) | 0.17536 |
| Color | Colorless |
| Melting point, ℃ | 1368 |
| Transmission range, um | 0.2-11 |
| Solubility in water@20℃,g/100 cm3 | 0.17 |
| Solubility in acids | soluble |
| Solubility in organic solvents: acetone, spirits, ether | insoluble |
| Thermal Conductivity@319K, W/(mxK) | 11.72 |
| Specific Heat Capacity, J/(kgxK) | 410 |
| Thermal Expansion@300K, 10-6/C | 18.1 |
| Young’s Modulus, GPa | 53.07 |
| Shear Modulus(G), GPa | 25.4 |
| Knoop Hardness, kg/mm2 | 82 |
| Bulk Modulus(K), GPa | 56.4 |
| Poisson’s Ratio | 0.343 |
| Mohs Hardness | 3.0 |
| Refractive Index as a function of wavelength | |||
| Wavelength(um) | Refractive Index | Wavelength(um) | Refractive Index |
| 014 | 1.815 | 5.14 | 1.45 |
| 0.15 | 1.678 | 6.50 | 1.44 |
| 0.20 | 1.557 | 8.00 | 1.43 |
| 0.26 | 1.51 | 8.60 | 1.42 |
| 0.3 | 1.50 | 9.20 | 1.41 |
| 0.36 | 1.49 | 9.80 | 1.40 |
| 0.48 | 1.48 | 10.60 | 1.39 |
| 1.85 | 1.47 | ||
| 3.24 | 1.46 | ||
