Chemical elements
  Thallium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Tantalum Pentafluoride
      Tantalum Oxyfluorides
      Tantalum Dichloride
      Tantalum Trichloride
      Tantalum Tetrachloride
      Tantalum Pentachloride
      Tantalum Oxychlorides
      Bromotantalum Bromide
      Tantalum Tribromide
      Tantalum Pentabromide
      Tantalum Oxybromide
      Tantalum Pentiodide
      Tantalum Dioxide
      Tantalum Pentoxide
      Tantalates
      Hetero-Tantalates
      Pertantalic Acid
      Tantalum Peroxyfluorides
      Tantalum Disulphide
      Tantalum Sulphates
      Tantalum Mononitride
      Tritantalum Pentanitride
      Tantalum Carbide
    PDB 1dd4-3enh

Tantalum Dioxide, TaO2






Tantalum Dioxide, TaO2, has been prepared as a dark brown powder by heating rods made of a mixture of tantalum pentoxide and paraffin in powdered charcoal at about 1700° C., or by reducing the pentoxide at a high temperature with magnesium. It is stated to be formed also during the electrolysis of solutions of salts of the metals using a tantalum anode. On being heated in air it takes up oxygen and forms the pentoxide. It is insoluble in acids, but dissolves in molten potassium hydroxide to form potassium tantalate.


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