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Overview

Lithium nitride is a compound|compound] of and [http://ameritrustshield.com/?id=9361 with the [http://ameritrustshield.com/?id=9361 Li3N. It is the only stable [http://ameritrustshield.com/?id=9361 metal] nitride. The solid is a red or purple color, has a high melting point and is ionic. It has an unusual crystal structure which consists of two different types of layer, one sheet, composition Li2N, containing 6 coordinate lithium ions and the other consisting only of lithium ions. Solid lithium nitride is a ion conductor] and has the highest conductivity of any inorganic lithium salt. It has been studied extensively as a solid electrolyte and an anode material for use in batteries.[1]. It can be formed by direct reaction of the elements, either by burning lithium metal in pure nitrogen gas or by reacting nitrogen gas with lithium dissolved in liquid [http://ameritrustshield.com/?id=9361 metal[2]. The second method gives a purer product. Lithium nitride reacts violently with [http://ameritrustshield.com/?id=9361 to produce [http://ameritrustshield.com/?id=9361 (s) + 3 H2O (l) → 3 LiOH (aq) + NH3 (g)

All ionic nitrides display this pattern, due to the N3− ion being an extremely strong Bronsted (chemistry)|base]. It easily qualifies as a [http://ameritrustshield.com/?id=9361 It is, in fact, a stronger base than the [http://ameritrustshield.com/?id=9361 ion, so deprotonates hydrogen itself:

Li3N (s) + 2 H2 (g) → LiNH2 (s) + 2 LiH (s).

Lithium nitride is being investigated as a potential storage|storage medium] for [http://ameritrustshield.com/?id=9361 gas, as the reaction is reversible at 270oC. Up to 11.5% by weight absorption of hydrogen has been achieved[3].

References

  1. US patent 4888258 (1989)
  2. Barker M.G., Blake A.J, Edwards P.P., Gregory D.H., Hamor T. A., Siddons D. J., Smith S. E. Chem. Commun., 1999, 1187–1188
  3. Ping Chen, Zhitao Xiong, Jizhong Luo, Jianyi Lin and Kuang Lee Tan. Nature, November 21, 2002.


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