Ceric fluoride, CeF₄

Ceric fluoride, CeF₄.H₂O, is obtained as a brown powder, insoluble in water, by acting upon ceric hydroxide with hydrogen fluoride and drying the residue at 100°. When heated, water, hydrogen fluoride, and possibly fluorine, are evolved. According to Brauner, the double salt 2CeF₄.3KF.2H₂O is produced by the action of potassium hydrogen fluoride on ceric hydroxide. Rimbach and Kilian could not obtain this salt, but have prepared a series of double salts of the type 2CeF₄.MF₂.7H₂O, where M = Cd, Cu, Co, Ni, or Mn. They are decomposed by water.