Aluminium fluoride
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| Aluminum fluoride | |
|---|---|
| Other names | Aluminum(III) fluoride Aluminum trifluoride |
| Identifiers | |
| CAS number | 7784-18-1 |
| Properties | |
| Molecular formula | AlF3 |
| Molar mass | 83.977 g mol−1 |
| Appearance | white, crystalline solid odorless |
| Density | 2.91 g cm−3, solid |
| Melting point |
1290 °C |
| Solubility in water | insoluble |
| Hazards | |
| EU classification | Harmful (Xn)[1] |
| NFPA 704 |
 0
1
0
|
| R-phrases | R22, R36/37/38[1] |
| S-phrases | S26[1] |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references |
|
Aluminum fluoride is the inorganic compound with the formula AlF3. It can be prepared by treating aluminum hydroxide or aluminum 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 aluminum.[2] 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 increases the electrolyte's conductivity.
Aluminium fluoride trihydrate is rarely found in nature as mineral rosenbergite.
[edit] References
- ^ a b c BGIA GESTIS (English version)
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
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