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BaF2

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BaF2

BaF2 is relatively hard but is highly sensitive to thermal shock. For its transmission range is 0.2 μm - 11 μm, the material is used for optical windows, lenses and prisms in UV-IR. Besides it can also be used as substrate for some applications. BaF2 is less resistant to attack by water than CaF2. Pronounced water attack occurs at 500 °C, but in a dry environment the material can be used to 800 °C. BaF2 is grown by modified Bridgman technique. Maximum available size: 200 mm Dia. x 50 mm Thk. Besides, BaF2 is usually used as scintillator for gamma detection. It is the fastest scintillating crystals up to now.

 

Main Properties of BaF2 crystal

 

Density

4.86 g/cm3,at 20°C

Melting Point

1354°C

Molecular Weight

175.36

Lattice Constant

6.196 Å

Thermal Conductivity

7.1 W/(m K), at 38°C

Specific Heat

456 J/(kg K)

Thermal Expansion

16.5 ~ 19.2 ×10–6 / K,± 60°C

Hardness (Knoop)

82kg/mm2

Hardness (Mho)

3

Young’s Modulus

53.05GPa

Shear Modulus

25.4GPa

Bulk Modulus

56.4GPa





Dielectric Constant

7.33,2×106HZ

Solubility in Water

0.17 g / 100 g，10℃

Hygroscopic no


Crystal Type

cubic, Class m3m

Cleavage Planes

(111)



Poisson's Ratio

0.343

Bandgap

9.1eV



Transparency Range

0.18 ~ 16.0 µm in IR, UV and DUV


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