Ammonium hexafluorovanadate is an inorganic chemical compound with the chemical formula (NH4)3VF6.

[1][2][3] The compound can be prepared by a fusion of ammonium hydrogen fluoride and vanadium trioxide.

[4] Also, a reaction of vanadium trioxide and ammonium bifluoride can produce the compound.

[5] Ammonium hexafluorovanadate forms powder.

[6] The compound decomposes to vanadium pentoxide if heated in open air:[7] Ammonium hexafluorovanadate is typically used as a catalyst at temperatures below 400 °C.