Thorium tetrafluoride
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]
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3D model (JSmol) |
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| ECHA InfoCard | 100.033.857 |
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CompTox Dashboard (EPA) |
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| Properties | |
| ThF4 | |
| Molar mass | 308.03 g/mol |
| Appearance | 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 | |
| Monoclinic, mS60 | |
| 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 |
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 | |
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 making carbon arc lamps, which provided high-intensity illumination for movie projectors and search lights.[4][5]
See also
References
- Dale L. Perry, Sidney L. Phillips (1995). Handbook of inorganic compounds. CRC Press. p. 412. ISBN 0-8493-8671-3.
- James D. Rancourt (1996). Optical thin films: user handbook. SPIE Press. p. 196. ISBN 0-8194-2285-1.
- W. Heitmann and E. Ritter (1968). "Production and properties of vacuum evaporated films of thorium fluoride". Appl. Opt. 7 (2): 307–9. 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 0-8247-2609-X.
- Thorium tetrafluoride International Bio-Analytical Industries, Inc.
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