Aluminium fluoride
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| Aluminium fluoride | |
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| General | |
| Geometry | Octahedral |
| Other names | Aluminium(III) fluoride Aluminium trifluoride |
| Molecular formula | AlF3 |
| Molar mass | 83.977 g mol−1 |
| Appearance | white, crystalline solid odorless |
| CAS number | [] |
| Properties | |
| Density and phase | 2.91 g cm−3, solid |
| Solubility in water | insoluble |
| Melting point | 1290 °C |
| Sublimation point | 1272 °C (at 1 atm pressure) |
| Hazards | |
| EU classification | not listed |
| NFPA 704 |
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| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Aluminium fluoride is the inorganic compound with the formula AlF3. It can be prepared by treating aluminium hydroxide or aluminium metal with HF. As a solid, its structure resembles that of rhenium trioxide, ReO3, consisting of distorted AlF6 octahedra.
AlF3 is refractory, in strong contrast to the other halides of aluminium.[1] AlCl3, AlBr3, and AlI3 are dimeric in the liquid and evaporate as dimers as well. In the gas phase, at ca. 1000 °C, aluminium fluoride exists as trigonal molecules of D3h symmetry group. The Al-F bond lengths are 163 pm.
Aluminium fluoride is an important additive during electrolyte aluminium production because it lowers the melting point of the alumina feed and increase the electrolyte's conductivity.
[edit] References
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
[edit] External links
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