Barium fluoride



Barium fluoride
Identifiers
CAS number 7787-32-8
Properties
Molecular formula BaF2
Molar mass 175.324 g.mol-1
Appearance white cubic crystals
Density 4.893 g.cm-3, solid
Melting point

1368 °C

Boiling point

2260 °C

Solubility in water 1.7 g/kg (26°C)
Structure
Crystal structure cubic
Thermochemistry
Std enthalpy of
formation ΔfHo298 		−???? kJ/mol
Standard molar
entropy So298 		 ??? J·K−1·mol−1
Hazards
EU classification Toxic (T)
R-phrases R20, R22
S-phrases S28
Flash point Non-flammable
Related Compounds
Other anions Barium bromide
Barium iodide
Other cations Strontium fluoride
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Barium fluoride (BaF2) is a chemical compound of fluorine, also known as Barium(II) fluoride. It is a solid which can be a transparent crystal.

Applications

Barium Fluoride is transparent from the transmittance at 200 nm is relatively low (0.60), but at 500 nm it goes up to 0.96-0.97 and stays at that level until 9 µm, then it starts falling off (0.85 for 10 µm and 0.42 for 12 µm).

Barium fluoride is also a common, very fast (one of the fastest) neutrons, and use pulse shape discrimination techniques to separate them from simultaneously occurring gamma photons.

When heated to 500 °C, it gets corroded by water, but in dry environment it can be used up to 800 °C. Prolonged exposure to moisture degrades transmission in the thermal shock.

Barium fluoride is used as a preopacifying agent and in enamel and glazing frits production. Its other use is in the production of welding agents (an additive to some metallurgy, as a molten bath for refining aluminium.

References

  1. ^ M. Laval, Barium Fluoride - inorganic scintillator for subnanoseconds timing, Nuclear Instruments and Methods, 206 :169-176, 1983
 
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