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 Carbide, UC2

Uranium Carbide, UC2, was first prepared by Moissan by heating together urano-uranic oxide (50 parts) and sugar charcoal (6 parts) in the electric furnace. By employing a current of 900 amperes and 50 volts, the reaction was complete in five minutes, and the fused mass on cooling yielded a lustrous, crystalline solid, of density 11.28 at 18° C. It may also be obtained by fusing the requisite quantities of uranous oxide and carbon in a Ruff electric vacuum furnace. The formula U2C3 was given to the product by Moissan, but by careful analysis and metallographic investigation it has been shown that the composition is correctly expressed by the formula UC2. The carbide is harder than quartz, but not so hard as corundum. It is often pyrophoric, and is readily oxidised; it inflames readily on crushing in an agate mortar, and will emit sparks when merely shaken in a strong glass vessel or when two pieces of the carbide are rubbed together. It melts at a temperature somewhat above 2250° C. It is attacked by fluorine at low temperatures, yielding uranous fluoride, but if a little chlorine is also present, the product is uranic fluoride, UF6. It reacts with chlorine at 350° C.; with bromine at 390° C.; with iodine below red heat; with nitrogen, yielding nitride, at 1100° C. It burns readily in oxygen at 370° C., forming the green oxide.

Uranium carbide is decomposed by water. The reaction proceeds slowly, and a mixture of solid, liquid, and gaseous hydrocarbons is produced. The gaseous product, which accounts for about one-third of the carbon present, consists of a mixture of the lower paraffin and olefine hydrocarbons, with a little acetylene, and from 30 to 60 per cent, of free hydrogen. The carbide is attacked by dilute mineral acids in the cold; by concentrated acids on warming. Nitric acid decomposes it most readily. Hydrogen chloride and hydrogen sulphide react at about 600° C. Uranium carbide is used as a catalyst in the synthetic production of ammonia.

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