Chemical elements
    Physical Properties
    Chemical Properties
      Silicon Tetrahydride
      Silicon Tetrafluoride
      Hydrofluosilicic Acid
      Silicon Subfluoride
      Silicon Tetrachloride
      Silicon Tetrabromide
      Silicon Tetra-iodide
      Mixed Halides of Silicon
      Halogen Derivatives of Silico-ethane
      Halogen Derivatives of Silicopropane
      Halogen Derivatives of Silicobutane
      Halogen Derivatives of Silicopentane and Silicohexane
      Silicon Oxychlorides
      Silicon Dioxide
      Silicoformic Anhydride
      Silico-oxalic Acid
      Silicomes-oxalic Acid
      Silicon Disulphide
      Silicon Monosulphide
      Silicon Oxysulphide
      Silicon Thiochloride
      Silicon Thiobromide
      Silicon Chloroitydrosulphide
      Silicon Selenide
      Silicon Tetramide
      Silicon Di-imide
      Silicon Nitrimide
      Siliconitrogen Hydride
      Silicon Nitrides
      Crystalline Silicon Monocarbide
      Silicon Dicarbide
      Silicon Carboxide
      Borides of Silicon
    PDB 1fuq-4ehr

Silicon Nitrides

Several nitrides of silicon appear to exist as white amorphous substances. They are:

SiN, density 3.17,
Si2N3, density 3.64, insoluble in HF,
Si3N4, density 3.44, soluble in HF, forming (NH4)2SiF6,

and are produced together when silicon is strongly heated in nitrogen. When silicon is heated in a crucible packed round with carbon, access of oxygen is almost prevented, and Si3N4 is formed together with the carbonitride Si2C2N (or Si3C3N), the carbide SiC and the carboxide SiCO.

According to Martignon, the nitride Si3N4 is formed when a mixture of silica and-carbon is heated in a current of nitrogen at 1400-1500° C., according to the equation:

3SiO2 + 6C + 2N2 = Si3N4 + 6CO.

From theoretical considerations the heat of formation of this nitride is calculated to be 159,300 calories.

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