Chemical elements
  Titanium
    Isotopes
    Energy
    Preparation
    Physical Properties
    Chemical Properties
      Titanium Trifluoride
      Titanium Tetrafluoride
      Hydrofluotitanic acid
      Potassium Titanifluoride
      Sodium Titanifluoride
      Titanium Dichloride
      Titanium Trichloride
      Titanium Tetrachloride
      Titanic Chloride
      Titanium Oxychlorides
      Hydrochlorotitanic Acid
      Addition Compounds of Titanium Tetrachloride
      Titanium Tribromide Hexahydrate
      Titanium Tetrabromide
      Titanic Bromide
      Hydrobromotitanic Acid
      Titanium Chlorobromides
      Titanium Di-iodide
      Titanium Tri-iodide
      Titanium Tetra-iodide
      Titanic Iodide
      Titanium Monoxide
      
Titanium Sesquioxide
      Titanium Dioxide
      Titanic Oxide
      Titanic Hydroxides
      Metatitanic Acid
      Titanates
      Titanium Monosulphide
      Titanium Sesquisulphide
      Titanium Disulphide
      Titanium Sulphates
      Titanous Sulphate
      Titanium Sesquisulphate
      Complex Sulphates of Tervalent Titanium
      Normal Titanic Sulphate
      Potassium Titanisulphate
      Potassium and Ammonium Titanylsulphates
      Titanous Nitride
      Titanic Nitride
      Titanamide
      Titanium Nitrogen Halides
      Titaninitric Acid
      Titanium Phosphide
      Titaniphosphoric Acid
      Titanium Carbide
      Titanium Cyanonitride
      Titanium Thiocyanates
      Titanium Sesquioxalate
      Titanitartrates and Allied Salts
      Titanium Silicide
      Pertitanates

Titanium Sesquioxide, Ti2O3






Titanium Sesquioxide, Ti2O3, is formed, probably in an impure state, when the dioxide is ignited strongly in a current of hydrogen, and is obtained in the form of lustrous, copper-coloured crystals, together with the trichloride and oxychloride, when a mixture of hydrogen and titanium tetrachloride vapour is passed over the white-hot dioxide.

When a microcosmic bead containing titanic oxide is heated in the reducing flame crystals of the sesquioxide separate.

This oxide is isomorphous with Elba haematite; and titanium iron ore, FeTiO3, is on this account sometimes regarded as an isomorphous mixture of iron and titanium sesquioxides.

Titanium sesquioxide dissolves in concentrated sulphuric acid, forming a violet solution of the corresponding sulphate. The hydrated sesquioxide, Ti2O3.xH2O, precipitated from a solution of the trichloride by alkali, may be black, red, brown, or dark blue. When suspended in water it constitutes a powerful reducing agent, even decomposing water, and being oxidised to the hydrated dioxide. When the hydrated sesquioxide is suspended in milk of lime and shaken with air, its oxidation is accompanied by an equivalent oxidation of water to hydrogen dioxide. A similar reaction occurs when chromic acid is added to titanium sesquioxide in presence of potassium iodide, the formation of titanic acid being accompanied by the liberation of an equivalent of iodine.


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