Aluminium fluoride
From Wikipedia, the free encyclopedia
| Aluminium fluoride | |
|---|---|
 |
|
| Other names | Aluminium(III) fluoride Aluminium 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 | not listed |
| NFPA 704 |
 0
1
0
|
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
|
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 increases 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 Information
 |
This inorganic compound-related article is a stub. You can help Wikipedia by expanding it. |
