Tags: Chemical Compound, Chemical Substance.
Niobium(IV) fluoride is a chemical compound with the formula NbF4; it is a nonvolatile black solid. It absorbs vapor strongly. It turns into NbO2F in moist air. NbF4 reacts with water to form a brown solution and a brown precipitate whose components are unknown. It is stable between 275°C and 325°C when heated in a vacuum. However it disproportionates at 350°C rapidly to form niobium(V) fluoride and niobium(III) fluoride:(at 350°C)