Chemical elements
    Physical Properties
    Chemical Properties
      Uranium Difluoride
      Uranium Tetrafluoride
      Uranous Oxyfluoride
      Uranium Hexafluoride
      Uranyl Fluoride
      Uranium Trichloride
      Uranium Tetrachloride
      Uranium Pentachloride
      Uranyl Chloride
      Uranyl Chlorate
      Uranyl Perchlorate
      Uranium Tetrabromide
      Uranyl Bromide
      Uranium Tetra-iodide
      Uranyl Iodide
      Uranyl Iodate
      Uranous Oxide
      Uranous Hydroxide
      Uranium Pentoxide
      Urano-uranic Oxide
      Uranium Trioxide
      Ammonium Diuranate
      Ammonium Hexa-uranate
      Hydroxylamine Uranate
      Hydroxylamine Potassio-uranate
      Barium Uranate
      Barium Diuranate
      Bismuth Uranate
      Iron Uranate
      Lithium Uranate
      Potassium Uranate
      Potassium Diuranate
      Potassium Tetra-uranate
      Potassium Hexa-uranate
      Rubidium Uranate
      Silver Diuranate
      Sodium Uranate
      Sodium Diuranate
      Sodium Triuranate
      Sodium Penta-uranate
      Strontium Uranate
      Zinc Uranate
      Peruranic acid
      Ammonium Peruranate
      Barium Peruranates
      Lithium Peruranate
      Nickel Peruranate
      Potassium Peruranate
      Sodium Peruranates
      Uranium Monosulphide
      Uranium Sesquisulphide
      Uranium Disulphide
      Uranium Oxysulphide
      Uranyl Sulphide
      Uranium Sulphite
      Uranyl Sulphite
      Complex Uranyl Sulphites
      Uranium Sulphate
      Uranium Dithionates
      Uranyl Sulphate
      Uranyl Pyrosulphate
      Uranyl Thiosulphate
      Uranyl Dithionate
      Uranium Sesquiselenide
      Uranium Diselenide
      Uranyl Selenide
      Uranyl Selenite
      Uranyl Selenate
      Uranium Telluride
      Uranium Nitrides
      Uranous Nitrate
      Uranyl Nitrate
      Uranium Monophosphide
      Uranous Phosphide
      Uranyl Hypophosphite
      Uranyl Phosphite
      Uranous Phosphates
      Uranyl Phosphates
      Complex Uranyl Phosphates
      Uranyl Aminophosphates
      Uranous Arsenide
      Uranyl Metarsenite
      Uranous Arsenate
      Uranyl Arsenates
      Complex Uranyl Arsenates
      Uranous Antimonide
      Uranous Antimonate
      Uranium Carbide
      Complex Uranyl Carbonates
      Ammonium Uranyl Carbonate
      Calcium Uranyl Carbonate
      Potassium Uranyl Carbonate
      Sodium Uranyl Carbonate
      Thallium Uranyl Carbonate
      Potassium Uranyl Ferrocyanide
      Uranyl Platinocyanide
      Uranyl Cyanate
      Uranyl Thiocyanate
      Uranium Silicide
      Uranium Boride
      Uranyl Perborate
    PDB 1anv-3pu4

Uranium Disulphide, US2

Uranium Disulphide, Uranous Sulphide, US2, is formed when metallic uranium is heated in sulphur vapour at 500° C.; at higher temperatures the uranium burns, yielding the same product. It is also produced when uranous chloride is heated to redness in a current of hydrogen sulphide; or better, by heating the less volatile double chloride, Na2UCl6, in carefully dried hydrogen sulphide, or hydrogen laden with sulphur vapour, the disulphide being separated from sodium chloride by rapidly washing the product in cold boiled water; or the sodium uranium chloride may be fused with certain sulphides, preferably stannous sulphide, but those of sodium, aluminium, magnesium, or antimony may be used, in a slow stream of dry hydrogen. If moisture is not rigorously excluded in these operations some uranyl sulphide is formed.

Uranium disulphide obtained from uranous chloride is a greyish- black amorphous powder. As prepared by Colani from the double chloride, it yields black to iron-grey lustrous crystals belonging to the tetragonal system, a:c = 1:0.6152. It may be heated to 1000° C. without decomposition or fusion. It oxidises in air to uranyl sulphide, and deflagrates at higher temperatures. It is decomposed by steam at red heat. It is fairly stable towards cold water, but is rapidly decomposed by dilute acids, nitric acid reacting very violently with formation of uranyl sulphate.

A hydrated uranium disulphide is obtained as a black precipitate when a solution of a uranous salt is treated with an alkali sulphide. It is unstable and oxidises on exposure to air.

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