Aluminium fluoride

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. 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.

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Aluminum Fluoride

فلوريد ألومنيوم Aluminiumfluorid フッ化アルミニウム 氟化鋁