Chemical elements
    Physical Properties
    Chemical Properties
    Atomic Weight
      Hydrogen Telluride
      Tellurium Tetrafluoride
      Tellurium Hexafluoride
      Tellurium Oxyfluorides
      Tellurium Dichloride
      Tellurium Tetrachloride
      Tellurium Perchlorate
      Tellurium Dibromide
      Tellurium Tetrabromide
      Tellurium Oxybromides
      Tellurium Tetra-iodide
      Tellurium Monoxide
      Tellurium Dioxide
      Tellurium Trioxide
      Telluric Acids
      Tellurium Disulphide
      Tellurium-Sulphur Sesquioxide
      Tellurium Sulphates
      Telluropentathionic Acid
      Tellurium Nitride
      Tellurium Nitrite
      Basic Tellurium Nitrate
      Carbon Sulphidotelluride
      Tellurium Dicyanide
    PDB 1el7-4fon

Tellurium Disulphide, TeS2

When hydrogen sulphide is passed into a solution of tellurium dioxide or into an acidified solution of a tellurite at room temperature, a reddish-brown precipitate is obtained Tellurium Disulphide, TeS2. There has been much doubt expressed, however, as to whether tellurium sulphide is a true compound or merely a mixture of the elements, since the sulphur is extractable by carbon disulphide.

Hageman has shown that below -20° C. the disulphide is stable, but that dissociation takes place at about that temperature, the degree increasing with rise in temperature; the degree of dissociation at any temperature may, of course, be determined by the amount of extractable sulphur present. The stability of the compound is then solely a matter of temperature.

Hageman has also shown that the compound TeS suggested by Snelling does not exist.

The existence of a trisulphide, TeS3, produced by the action of hydrogen sulphide on a solution of telluric acid, is improbable, the product behaving like a mixture containing free sulphur and tellurium.

Tellurium and sulphur do not combine when fused together, but are miscible in all proportions in the molten condition.

Certain unstable thiotellurites have been prepared by the action of hydrogen sulphide on solutions of alkali tellurites, the most definite being the potassium salt, K2TeS3.

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