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 Disulphide, TaS2






Tantalum Disulphide, TaS2, is most conveniently prepared by passing a dry mixture of hydrogen sulphide and carbon disulphide vapour over tantalum pentoxide between 900° and 1300° C. It has also been obtained by the action of carbon disulphide on tantalum pentoxide at a white heat, by the action of hydrogen sulphide on tantalum pentachloride, or by gently heating tantalum in sulphur vapour, but the true composition of the products in these cases is somewhat uncertain. Tantalum disulphide is a black powder with a metallic lustre; when heated above 1200° C. it forms yellowish crystals. It burns in air or oxygen with evolution of sulphur dioxide; the tantalum pentoxide simultaneously produced contains sulphuric anhydride. Hydrogen attacks it only feebly; chlorine does so more readily. It takes up traces of water, which it retains very firmly; at high temperatures the absorbed water reacts to form hydrogen sulphide and tantalum oxides. Concentrated solutions of potassium polysulphides and boiling hydrochloric acid are without action; it is slowly attacked by cold nitric acid, hydrofluoric acid, sulphuric acid, or a mixture of nitric acid and hydrofluoric acid; boiling nitric acid and aqua-regia oxidise it completely to tantalum pentoxide and sulphuric acid.
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