Chemical elements
  Aluminium
    Isotopes
    Energy
    Preparation
    Physical properties
    Chemical properties
      Aluminium subfluoride
      Aluminium trifluoride
      Aluminium trichloride
      Aluminium tribromide
      Aluminium iodide
      Aluminium chlorate
      Aluminium perchlorate
      Aluminium bromate
      Aluminium periodate
      Aluminium suboxide
      Alumina
      Aluminium sesqui-oxide
      Aluminium peroxide
      Aluminium hydroxides
      Aluminates
      Tricalcium aluminate
      Sodilim aluminate
      Aluminium sesqui-sulphide
      Aluminium selenide
      Aluminium telluride
      Aluminium sulphite
      Aluminium sulphate
      Alums
      Sodium alum
      Potassium alum
      Ammonium alum
      Hydroxylamine alum
      Silver alum
      Pseudo-alums
      Aluminium dithionate
      Aluminium selenite
      Aluminium selenate
      Aluminium chromate
      Aluminium molybdate
      Aluminium silicomolybdate
      Aluminium tungstate
      Aluminium silicotungstate
      Aluminium phosphotungstate
      Aluminium nitride
      Aluminium phosphide
      Aluminium arsenide
      Aluminium nitrate
      Aluminium Phosphates
      Basic aluminium arsenite
      Aluminium carbide
      Aluminium carbonate
      Aluminium thiocyanate
      Aluminium oxalate
      Aluminium alkyls
      Aluminium Hydrocarbon
      Aluminium acetylacetonate
      Aluminium silicide
      Aluminium silicates
      Leucite
      Nephelite
      Spodumene
      Topaz
      Beryl
      Tourmaline
      Axinite
      Sodalite
      Hauynite
      Kaolinite
      Aluminosilicic acids aluminosilicates
      Aluminium Borides
      Aluminium Boride
      Aluminium Boride
      Aluminium borocarbides
      Aluminium borate
      Aluminium sodium perborate
    Applications
    PDB 1a6e-1zca
    PDB 2b8w-3i62
    PDB 3kql-5ukd

Aluminium nitride, AlN






Aluminium nitride, AlN, discovered by Mallet, may be prepared by heating finely divided aluminium in nitrogen at 820° to 1000°, powdering the product, and reheating in the gas once or twice. It is produced when aluminium is heated to 700° in ammonia, and is manufactured by heating a mixture of alumina and carbon in a current of nitrogen: -

Al2O3 + 3C + N2 ⇔ 2AlN + 3CO.

In Serpek's process, a mixture of crushed alumina or bauxite and carbon travels down an inclined rotary kiln, drops into a hopper, and is fed into another rotary kiln, a short length of which is maintained at 1500° to 1800°. Producer gas passing up to the kiln supplies the requisite nitrogen. The carbon monoxide produced is burned and the hot gases blown up the first kiln to preheat the initial charge.

As usually prepared, aluminium nitride forms a grey, amorphous solid. It begins to sublime, with partial dissociation into its elements, at c. 1900° C.; the vapour condenses to colourless, hexagonal needles. It is decomposed by water, slowly at 0°, rapidly at 100°, aluminium hydroxide and ammonia being produced; consequently it dissolves readily in alkali hydroxides.


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