Nitride, lithium

Among the alkali metals, only lithium reacts with N2 at room temperature and normal atmospheric pressure to give red-brown, moisture-sensitive lithium nitride Li3N (a-form), which has a high ionic conductivity. 

RbgO P63/m (Rb9C 2)Rb3 three Rb atoms per Rbg02 cluster 

CS7O P6m2 (CsnO3)Cs10 ten Cs atoms per Csu03 cluster, Fig. 12.2.2(a) 

Crystal structure of Li3N (a) O2N layer, (b) the unit cell. The small black circle and large open circle represent Li and N atoms, respectively. 

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Vl L, J R Walker and C R A Catlow 1984. A Molecular Dynamics Simulation Study of the iperionic Conductor Lithium Nitride I. Journal of Physical Chemistry 17 6623-34. 

Normally, lithium hydride ignites in air only at high temperatures. When heated it reacts vigorously with CO2 and nitrogen. With the former, lithium formate is obtained. Reaction at high temperature with nitrogen produces lithium nitride. Therefore, dry limestone or NaCl powders are used to extinguish LiH fires. Lithium hydride reacts exothermically with moist air and violently with water. 

Uses. The largest use of lithium metal is in the production of organometaUic alkyl and aryl lithium compounds by reactions of lithium dispersions with the corresponding organohaHdes. Lithium metal is also used in organic syntheses for preparations of alkoxides and organosilanes, as weU as for reductions. Other uses for the metal include fabricated lithium battery components and manufacture of lithium alloys. It is also used for production of lithium hydride and lithium nitride. 

Lithium Amide. Lithium amide [7782-89-0], LiNH2, is produced from the reaction of anhydrous ammonia and lithium hydride. The compound can also be prepared by the removal of ammonia from solutions of lithium metal in the presence of catalysts (54). Lithium amide starts to decompose at 320°C and melts at 375°C. Decomposition of the amide above 400°C results first in lithium imide, Li2NH, and eventually in lithium nitride, Li N. Lithium amide is used in the production of antioxidants (qv) and antihistamines (see HiSTAMlNE AND HISTAMINE ANTAGONISTS). 

Lithium Nitride. Lithium nitride [26134-62-3], Li N, is prepared from the strongly exothermic direct reaction of lithium and nitrogen. The reaction proceeds to completion even when the temperature is kept below the melting point of lithium metal. The lithium ion is extremely mobile in the hexagonal lattice resulting in one of the highest known soHd ionic conductivities. Lithium nitride in combination with other compounds is used as a catalyst for the conversion of hexagonal boron nitride to the cubic form. The properties of lithium nitride have been extensively reviewed (66). 

Solid Electrolytes. Of the salt-like nitrides, only Li N has attracted technical interest. Lithium nitride has an uncommonly high ionic... 

Since finely divided lithium floats on the surface of the solvent and will be in contact with the atmosphere in the reaction vessel, an argon atmosphere, rather than a nitrogen atmosphere, should be used to avoid formation of the insoluble reddish-brown lithium nitride. 

Suppose that Si-28 ( Si) is taken as the standard for expressing atomic masses and assigned an atomic mass of 10.00 amu. Estimate the molar mass of lithium nitride. 

The third aspect, the stability range of solid electrolytes, is of special concern for alkaline-ion conductors since only a few compounds show thermodynamic stability with, e.g., elemental lithium. Designing solid electrolytes by considering thermodynamic stability did lead to very interesting compounds and the discovery of promising new solid electrolytes such as the lithium nitride halides [27]. However, since solid-state reactions may proceed very slowly at low temperature, metasta-... 

Cubic boron nitride is obtained from hexagonal boron nitride at high pressure and temperature in the presence of lithium nitride as a catalyst. It is almost as hard as diamond and has superior chemical resistance and a much higher oxidation threshold.Efforts to... 

Reaction between acyl halides and lithium nitride... 

Li + N2 2 Li3 N What mass of the product, lithium nitride, can be prepared from 4.5 g of lithium metal and 9.5 g of molecular nitrogen ... 

In the gaseous phase and in the presence of lithium, nitrogen gives lithium nitride U3N A = -197.48 KJ/mole, which is the only alkali nitride known to explode when heated between 115°C and 293°C. 

See Copper Complexing agents, Water Lithium nitride... 

See Lithium nitride Transition metal halides Sulfur nitrides... 

Another interesting lithium-based system is Li3N/Li2NH [53]. Lithium nitride can be hydrogenated to lithium imide and lithium hydride (5.4 wt% H2). The latter reaction can be used for reversible storage at 250°C. The formation of ammonia can be completely avoided by the addition of 1% TiCl3 to the system, which has the positive additional effect to improve the kinetics [54]. Very fast kinetics has been reported for a partially oxidized lithium nitride [55]. 

Ichikawa, T., S. Isobe, N. Hanada, and H. Fujii, Lithium nitride for reversible hydrogen storage, /. Alloys Compd., 365,271,2004. 

Lithium niobate devices, commercial suppliers of, 17 458 Lithium nitrate, 15 141 Lithium nitride, 15 141 17 199... 

Hydrogen hexafluorophophosphate, Borosilicate glass, 4360 Hydrogen peroxide, Diethyl ether, 4477 Imidazoline-2,4-dithione, 1141 Lithium nitride, Silicon tetrafluoride, 4688 Magnesium, Metal oxides, 4690 Manganese trifluoride, 4335 f Methylacrylate, 1531 Nitric acid, Glassware, 4436 Oxalic acid, Urea, 0725... 

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