Iron oxide fluorides

See Iron(III) oxide Calcium disilicide Metal fluorides... 

Thermal dissociation produces ammonium fluoride and ammonia at elevated temperatures products contain ammonia and hydrogen fluoride. It forms a colorless double salt, ammonium iron fluoride SNEUF FeFs, with iron, a reaction of commercial apphcation for removing stains from fabric. It reacts with many metal oxides at elevated temperatures forming double fluorides ... 

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Hydrofluoric acid — (HF) A solution of hydrogen fluoride in water. The pure hydrogen fluoride is characterized by Mw of 20.0063 gmol-1 m.p. -83.55 °C (1 atm) b.p. 19.5 °C (latm). When concentrated, this colorless fuming liquid is extremely corrosive and can dissolve almost all inorganic oxides such as silicate compounds or oxides of metals like stainless steel, aluminum, and uranium however, it can be stored in casted iron bottles because a corrosion-resistant iron fluoride layer protects the metal. It is used for several purposes such as the preparation of titanium oxide nano tube arrays [i], silicon nanoparticles [ii] and electrochemical etching of silicon [iii], electrochemical deposition of lithium [iv], etc. 

The last-named is also obtained when hydrogen fluoride is passed over red-hot iron, ferric oxide, or ferric chloride 4 or by heating the double salt, ferric ammonium fluoride, FeF3.3NH4F, in an inert gas. 

Gin s electrolytic method for ferrovanadium1 uses vanadic acid dissolved in a bath of fused iron fluoride and calcium carbide. The anode is a mixture of vanadic acid and retort carbon, and the cathode is fused steel. (2) A French process uses vanadic acid dissolved in calcium fluovanadate, and a current of 0.7 ampere per square centimeter of anode surface. (3) An American process electrolyzes a solution of vanadic acid in molten ferrosilicon. (4) Another American process passes an electric current through a charge made up of vanadium oxide and the calculated amounts of iron and carbon. 

IRON FLUORIDE (7783-50-8) FjFe Noncombustible solid. Forms acid solution in water. Contact with strong oxidizers may... 

Both sulphur trioxide and sulphuryl chloride fluoride oxidize phosphines (and triphenylarsine) to the corresponding oxides in excellent yields under mild conditions. The effect of various iron compounds as catalysts for the oxidation of phosphine to phosphine oxide have been investigated triphenylphosphine oxide is formed quantitatively at 30—70 °C in oxygen at one atmosphere. 

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