Ammonium hexafluoroferrate is an inorganic compound with the chemical formula .
Structure Ammonium hexafluoroferrate is isomorphous with the analogous compounds of aluminum and trivalent titanium, vanadium, and chromium. It crystallizes in a cubic lattice.
Synthesis Ammonium hexafluoroferrate can be obtained by reacting ferric fluoride trihydrate and ammonium fluoride in water.
Reactions Upon heating, the compound loses two moles of ammonium fluoride, forming ammonium tetrafluoroferrate(III). Further heating results in the gradual loss of ammonium fluoride, the final products being iron(III) fluoride mixed with oxide.
The compound reacts with xenon difluoride to produce , , Xe, and HF.
Uses Ammonium hexafluoroferrate is used as a fire retardant.
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