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| Identifiers | |
|---|---|
| CAS Number | |
| ECHA InfoCard | 100.033.857 
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| CompTox Dashboard (EPA) | |
| Properties | |
| Chemical formula | ThF4 |
| Molar mass | 308.03 g/mol |
| Appearance | hygroscopic white crystals |
| Density | 6.3 g/cm |
| 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 | |
| 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 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).
 Y verify (what is ?)
Infobox references
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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.
References
- Dale L. Perry, Sidney L. Phillips (1995). Handbook of inorganic compounds. CRC Press. p. 412. ISBN 0849386713.
- Rancourt, James D. (1996). Optical thin films: user handbook. SPIE Press. p. 196. ISBN 0819422851.
- W. Heitmann and E. Ritter (1968). "Production and properties of vacuum evaporated films of thorium fluoride". Appl. Opt. 7 (2): 307. doi:10.1364/AO.7.000307. PMID 20062461.
- McKetta, John J. (1996). Encyclopedia of Chemical Processing and Design: Thermoplastics to Trays, Separation, Useful Capacity. CRC Press. p. 81. ISBN 082472609X.
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