Ammonium hexafluorozirconate is a complex inorganic compound of nitrogen, hydrogen, fluorine, and zirconium with the chemical formula . It is the ammonium salt of hexafluorozirconic acid.
Ammonium hexafluorozirconate can be prepared by adding ammonium fluoride solution to zirconium oxide solution in hydrofluoric acid.
Ammonium hexafluorozirconate is used in anti-corrosion treatment of metals; it forms ultrafine metal powder by thermal decomposition. It is also used as an additive in dental impression materials.
Ammonium hexafluorozirconate is of research interest for the treatment of silica substrates used in the activation of metallocene catalysts. The hexafluorozirconate anion is suitable because it contains a Lewis acidic metal.
Several mixed ammonium hexafluorozirconates with alkali metal cations isomorphously replacing ammonium have been characterized.
An ammonium heptafluorozirconate ((NH<sub>4</sub>)<sub>3</sub>ZrF<sub>7</sub>) has also been characterized.