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BaF2 Barium Fluoride Infrared Optics Subsrate for Optical Scintillation Applications
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. The highest quality BaF2 has been used for scintillation crystals. BaF2 can also be used a crystal substrates for the epitaxial growth of thin films.
Optical Properties | |
Transmission Range | 150 nm to 14 um |
Transmittance | >94% at 350 nm to 10.8 um |
Refractive Index | 1.4624 at 2.58 um 1.3936 at 10.35 um |
Reflection Loss | 6.8% at 2.58 um (both surfaces) 5.3% at 10.35 um (both surfaces) |
Radiation Length | 20.6 mm |
Residual Radiation Peak | 47 nm |
Emission Peak | 310 nm slow; 220 nm fast |
Decay Constant | 620 ns slow; 0.6 ns fast |
Light Output | 20% slow; 4% fast |
Absorption Coefficient | 3.2 x 10^-4 cm-1 at 6 um |
Physical Properties | |
Density | 4.89 g/cm3 |
Melting Point | 1280 °C |
Thermal Conductivity | 11.72 W.m-1K-1 at 286K |
Thermal Expansion Coefficient (CTE) | 18.1 x 10-6 /C at 273K |
Knoop Hardness | 82 with 500g indenter (kg/mm2) |
Specific Heat Capacity | 410 J/(kg.K) |
Dielectric Constant | 7.33 at 1 MHz |
Young's Modulus (E) | 53.07 GPa |
Shear Modulus (G) | 25.4 GPa |
Bulk Modulus (K) | 56.4 GPa |
Apparent Elastic Limit | 26.9 MPa (3900 psi) |
Poisson Ratio | 0.343 |
Chemical Properties | |
Solubility | 0.0017 g in 100g water at 23°C |
Molecular Weight | 175.36 g/mole |
Structure | Cubic Crystal |
Cleavage Plane | (111) |
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