Thorium tetrafluoride

Thorium(IV) fluoride

Identifiers
CAS Number	13709-59-6
EC Number	237-259-6
Jmol 3D model	Interactive image
PubChem	83680
InChI InChI=1S/4FH.Th/h4*1H;/q;;;;+4/p-4
SMILES F[Th](F)(F)F
Properties
Chemical formula	ThF4
Molar mass	308.03 g/mol
Appearance	hygroscopic white crystals
Density	6.3 g/cm3
Melting point	1,110 °C (2,030 °F; 1,380 K)
Boiling point	1,680 °C (3,060 °F; 1,950 K)
Refractive index (nD)	1.56
Structure
Crystal structure	Monoclinic, mS60
Space group	C12/c1, No. 15
Vapor pressure	{{{value}}}
Related compounds
Other anions	Thorium(IV) chloride Thorium(IV) bromide Thorium(IV) iodide
Other cations	Protactinium(IV) fluoride Uranium(IV) fluoride Neptunium(IV) fluoride Plutonium(IV) fluoride
Related compounds	Thorium dioxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Thorium(IV) fluoride (ThF₄) is an inorganic chemical compound. It is a white, hygroscopic powder which can be produced by reacting thorium with fluorine gas. At temperatures above 500 °C, it reacts with atmospheric moisture to produce ThOF₂.

Uses

Despite its (mild) radioactivity, thorium fluoride is used as an antireflection material in multilayered optical coatings. It has excellent optical transparency in the range 0.35–12 µm, and its radiation is primarily due to alpha particles, which can be easily stopped by a thin cover layer of another material.

Thorium fluoride was used in manufacturing carbon arc lamps, which provided high-intensity illumination for movie projectors and search lights.

See also

• Liquid fluoride thorium reactor