Preparation of High Purity TiF3 by the Thermal Decomposition of Ammonium Tetrafluorotitanate (III)

Abstract

High purity TiF3 was prepared by the thermal decomposition of ammonium tetrafluorotitanate (III). TiF3 was prepared more easily by this method than the previously reported ones. When titanium metal was dissolved in 55 wt% hydrofluoric acid in an argon atmosphere until hydrogen evolution stopped, the dark violet precipitate was formed. Ammonium tetrafluorotitanate(III) was formed by the addition of excess ammonium fluoride to the solution containing this precipitate. TiF3 was easily prepared by the thermal decomposition of ammonium tetrafluorotitanate (III) in a hydrogen or an argon atmosphere at 600~650oC. Ammonium tetrafluorotitanate(III) colored yellowish pink and oxidized gradually in an air. © 1973, The Chemical Society of Japan. All rights reserved.