24 Hours

Monday to Sunday

Barium Fluoride

Materials containing barium fluoride (BaF2) are frequently modified for usage in our spectrum components. It is frequently used as a viewport window for thermal imaging and is typically suitable for applications in the passive infrared range (8 to 14 m). The highest quality BaF2 is also used as the fastest scintillator material known and used in high energy physics experiments. Alfa Chemistry can custom manufacture optical components of almost any shape and size using BaF2 materials according to customer requirements. If you need help, please contact us.

Advantages and Uses of Barium Fluoride Materials

BaF2 is a popular optical fluoride. It is transparent from UV to IR, from 150 to 200 nm to 11 to 11.5 µm. BaF2 can be utilized as a viewing window for IR spectroscopy and thermal imaging in the LWIR to far IR bands. For the detection of X-rays, gamma rays, or other energetic particles, BaF2 is a popular and extremely quick scintillator. Gamma photon detection in positron emission tomography is one of its applications. The highest purity BaF2 VUV material can be recognized as a fast scintillator grade.

BaF2 ceramics and single crystal samples under room light (left) and UV (254 nm) light (right).Fig 1. BaF2 ceramics and single crystal samples under room light (left) and UV (254 nm) light (right). (Kato T, et al. 2017)

BaF2 has a high water and radiation resistance. In humid situations, it begins to degrade at temperatures exceeding 500 ℃, while in drier environments, the limit can be pushed to 800 ℃. BaF2 is grown by vacuum Stockbarger technology. BaF2 does not exist in its natural state and all materials must be chemically synthesized, which makes BaF2 relatively expensive to produce. BaF2 is highly sensitive to thermal shock. It is also well polished and can be etched.

Properties of Barium Fluoride Materials

Density4.89 g/cc
Molecular Weight    175.36
Solubility0.17g/100g water at 23 ℃
Class/StructureCubic CaF2, Fm3m, (111) cleavage
Melting Point1386 ℃
HardnessKnoop 82 with 500g indenter
Refractive Index1.45 at 5 μm
Transmission Range0.15 ~ 12 μm
Reflection Loss6.5% at 5 μm
Reststrahlen Peak47 μm
Absorption Coefficient3.2x10-4 cm-1 @ 6 μm
dn/dT-15.2x10-6 at 6 μm
Youngs Modulus (E)53.07 GPa
Shear Modulus (G)25.4 GPa
Bulk Modulus (K)56.4 GPa
Thermal Expansion18.1x10-6/℃ @ 273 K
Thermal Conductivity11.72 W/m/K at 286K
Specific Heat Capacity410 J Kg-1 K-1 at 293K
Poisson Ratio0.343
Elastic CoefficientsC11 = 89.2, C12 = 40.0, C44 = 25.4

About refractive index parameters.
"No" means ordinary light.



  1. Kato T, et al. (2017). "Development of BaF2 Transparent Ceramics and Evaluation of The Scintillation Properties." Radiation Measurements. 106: 140-145.

Please kindly note that our products and services are for research use only.