Ammonium hexafluorotitanate is the inorganic compound with the chemical formula (NH<sub>4</sub>)<sub>2</sub>[TiF<sub>6</sub>]. A colorless salt, the compound consists of ammonium ions and the hexafluorotitanate dianion.
The compound is encountered in the extraction of titanium from its principal ore ilmenite: the ore is treated with excess ammonium fluoride:
After removal of iron impurities, the titanium is recovered as a hydrated titanium dioxide by treatment of the aqueous extract of the hexafluoride with ammonia:
Many salts of hexafluorotitanate have been characterized by X-ray crystallography. In the lattice [TiF<sub>6</sub>]<sup>2-</sup> octahedra interact with the ammonium cations by hydrogen bonds.