Nitrogen

Nitrides

Very valuable gemstone like compounds.

• BN boron nitride [1]
• AlN aluminium nitride [2] (note: the phosporus analogon is highly toxic)
• GaN gallium nitride [3] (gallium is rare)
• InN indium nitride [4] (indium is very rare)

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• BCN Heterodiamond [5]

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Carbon Group:

• β-C₃N₄ beta carbon nitride [6]
• Si₃N₄ silicon nitride [7]
  pseudo phase diagram towards SiO₂ is filled by silicon_oxynitride [8] -- mineral: Si₂N₂O sinoite [9]
• Ge₃N₄ [10] (Ge is rare)
• Sn₃N₄
• no lead nitrides?

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Nonmetallic: (mid level abundance elements)

• Cu₃N copper(I)-nitride (de: [11]) despite the metal excess nonmetallic -- (and Ag₃N silver nitride [12])
• Zn₃N₂ zinc nitride [13]

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• Na₃N [14] (reacts with water, exotic structure) and Li₃N lithium nitride [15] (lithium is not too abundant)
• Mg₃N₂ magnesium nitride [16] (reacts with water) and Be3N2 beryllium nitride [17] (Be is rare and poisonous)
• Ca₃N₂ calcium nitride [18] (reacts with water)
• potassium nitride?

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Metallic:

• TiN titanium nitride [19] and ZrN zirconium nitride [20] and YN yttrium nitride [21]
• VN vanadium nitride [22] and NbN niobium nitride [23] and TaN tantalum nitride [24] (vanadium, niobium and tantal range from rare to very rare)
• CrN chromium nitride [25] (chromium is not too abundant) and WN tungsten nitride [26] (tungsten is rare - compound susceptible to water)
• Fe₂N (Fe₃N) Fe₄N Fe₇N₃ Fe₁₆N₂ -- diverse iron nitrides [27]

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Molecular solids (not really suitable as structural materials):

• Volatile molecular solid: S₂N₂ [28]
• molecular solid: α,γ,δ P₃N₅ [29]
• Tellurium_nitride? [30] (Te is very rare)

Wikipedia: Nitride Category:Nitrides

Explosive

Since nitrogen likes to form strong triple bonds with low energy (N₂ gas) many nitrogen compounds are explosive.

Nitrates

The salts of the nitrogen acids are usually rather water soluble. Even the earth alkali salts.
Since they are also rather soft even isolated against environment they seem unsuitable as structural materials.

• NaNO₃ sodium nitrate [31] (common name: soda) mineral: nitratine [32] Mohs 1.5-2
• KNO₃ potassium nitrate [33] (common name: salpeter) mineral: niter [34] Mohs 2

• Mg(NO₃)₂ magnesium nitrate [35] (as hexahydrate: nitromagnesite)
• Ca(NO₃)₂ (as tehrahydrate: nitrocalcite)

Sodium is the cationic counterpart that makes salts maximally water soluble.

Misc

• Nitrogen can (in form of the ammonium ion) take the place of a electro-positive metal in a salt. This is very unusual for a nonmetal. (Wikipedia: Ammonium_salts)
• By dissolving sodium in ammonia one can solvate free electrons. (Wikipedia: Solvated_electron)

External links

• cubic gauche solid nitrogen (cg-N)
  This is the explosive with highest known energy density.
• Isotopes of nitrogen
  – 99.6% ¹⁴N – unusual whole numbered spin
  – 0.4% ¹⁵N – used for nitrogen-15 nuclear magnetic resonance spectroscopy (NMR) and nitrogen-15 tracing