Thorium(IV) fluoride

Thorium(IV) fluoride
Identifiers
CAS number 13709-59-6 Y
Properties
Molecular formula ThF4
Molar mass 308.03 g/mol
Appearance hygroscopic white crystals
Density 6.3 g/cm3
Melting point

1110 °C

Boiling point

1680 °C

Refractive index (nD) 1.45
Structure
Crystal structure Monoclinic, mS60
Space group C12/c1, No. 15
Hazards
EU Index Not listed
Flash point Non-flammable
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
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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.[1]

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.[2][3]

Thorium fluoride was used in manufacturing carbon arc lamps, which provided high-intensity illumination for movie projectors and search lights.[4]

References