LijN, Lithium nitride

El 5.3 (a) Hydrolysis of LijN. Lithium nitride can be prepared directly from the elements. Since it contains ions,... 

LijN, Lithium nitride, 22 48 LuCl], Lutetium chloride, 22 39 LUCI3CS2, Cesium lutetium chloride, 22 6 LuCI CS], Cesium lutetium chloride, 22 6 LuFuNjOJVCjjH, , Lutetium(III), hex-akis(diphenylphosphinic amide)-, tris(hexafluorophosphate), 23 180 LuN,0 C,Hl6, Ytterbium(lU), trinitrato( 1,4,7,-10-tetraoxacyclododecane)-, 23 151 LuNjO C m, Lutetium(III), trini-... 

The most conductive material of this class is lithium nitride [1-3, 7,10,13, 22, 242]. Its hexagonal structure (Figure 7.24) contains two types of lithium ion, vhth coordination numbers 2 and 3 only the latter contributes to the transport process and, thus, conductivity perpendicular to the principal axis is two orders of magnitude higher than that parallel to c. Stoichiometric LijN does not contain lithium defects. 

The only compound formed by alkali metals and nitrogen being stable in contact with the liquid metal is lithium nitride, LisN. This compound is formed by an exothermal reaction of elemental nitrogen with lithium metal The nitride can be considered to have a typical ionic structure, N being coordinated by 8 Li ions in a regular way. LijN has a hexagonal structure with a = 0.365 nm, c = 0.387 nm, Z = 1 and the space group P6/mmm... 

The very stable lithium nitride melts in a nitrogen atmosphere at 813 1 °C and has a considerably high solubility in the liquid metal as indicated by the Li LijN phase diagram in Fig. 10... 

The phase diagram of the Li-LijN system was first described by Bol shakov, while exact thermodynamic data for LijN are reported by Yonco et al. Lithium nitride forms as a simple eutectic with Li with the eutectic point near 0.05 mol% LisN at 180.3°. The melting point of LijN is 813 1°. 

Lithium nitride cyrstallizes with a hexagonal point symmetry. The lattice constants are a = 3.648A and c = 3.875and the space group is Along the c axis, LijN forms an alternating structure of Li and LijN layers. The movement of Li" ions may be preferred within the LijN layers. ... 

Difluorides such as PbF2 with the fluorite structure exhibit fast ion conduction due to facile F ion transport (Section 6.4.5). An interesting structure showing Li" conduction is that of LijN (Rabenau, 1978). Conduction is two-dimensional. Cooperative basal plane excitations involving the rotation of six Li ions by 30 about a common ion to edge positions (positions midway between ions in the Li2N layer) seem to be responsible for conduction in this nitride. In the fluorite structure, a rotation by 45 of a single cube of F ions seems to be involved. The Zintl alloy LiAl is also a lithium-ion conductor. 

Lithium, Group 1A( 1) Li is the only member of its group that forms a simple oxide and nitride, Li20 and LijN, with O2 and N2 in air, and only Li forms molecular compounds with organic halides ... 

Interestingly, lithium metai reacts with nitrogen at room temperature to form a iayer of iithium nitride, LijN, on the metai surface (see photo above). 

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