| Thorium(IV) fluoride | |
|---|---|
| Identifiers | |
| CAS number | 13709-59-6 |
| 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 |
| (verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 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.[1]
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]
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