Crystal Structure of Lithium Nitride Li3N

Overview of lithium nitride Li3N powder

Lithium nitride, a metal nitrogen compound with the chemical formula Li3N, is a purple or red crystalline solid with a pale green luster in reflected light and a ruby color in transmitted light. Long-term exposure to air will eventually turn into lithium carbonate. Alkaline metal nitride chemistry is extremely limited, and of the binary compounds only lithium nitride is stable and easy to prepare (sodium and potassium nitrides can only be prepared under more extreme conditions).

At room temperature, lithium nitride can be partially formed by exposing metallic lithium to air. Lithium generates lithium nitride in a nitrogen stream, which is 10-15 times faster than in air. At this time, all lithium is converted into lithium nitride. Compared with this property, other alkali metals are difficult to form nitrides, such as sodium nitride, which can only be deposited on sapphire with atomic beams at low temperature, and will decompose with a little heating. Lithium nitride is easily hydrolyzed to generate lithium hydroxide and ammonia gas, especially fine powdered lithium nitride, which can burn violently when heated in air. Therefore, lithium nitride must be handled in an inert atmosphere such as nitrogen. It can be used as nitriding agent, reducing agent in organic reaction and nitrogen source in inorganic reaction.

Lithium nitride Li3N Crystal Structure

Lithium nitride belongs to the hexagonal crystal system, and the crystal structure is shown in the figure.

In the lithium nitride crystal, there are lithium and nitrogen layers composed of lithium and nitrogen atoms. The arrangement is that the lithium atoms are arranged in the manner of carbon atoms in the graphite crystal, and the nitrogen atoms are in the center of the hexagon formed by the lithium atoms. A lithium layer exists between the lithium and nitrogen layers. Because the ratio of lithium to nitrogen in the lithium and nitrogen layers is 2:1, which is Li2N, which does not conform to the stoichiometric formula Li3N, there is a lithium layer between every two lithium and nitrogen layers.

In the lithium nitride unit cell, the distance between Li-N is 213pm, which is close to the sum of the ionic radii of lithium ions and nitrogen negative ions, and the distance between each lithium and nitrogen layer and the adjacent lithium layer is 194pm, which indicates that the Lithium is an ionic compound.

Application of lithium nitride Li3N powder

Lithium nitride is prepared by the direct reaction of elemental nitrogen and lithium, usually by burning lithium in pure nitrogen. In the laboratory and industry, this method is the most commonly used method for preparing lithium nitride. Alternatively, nitrogen gas can be injected into liquid sodium dissolved in lithium metal to produce purer lithium nitride. Lithium nitride has many applications.

1. Solid electrolyte

Lithium nitride is a fast ionic conductor with higher electrical conductivity than other inorganic lithium salts. Many studies have been conducted on the use of lithium nitride as a solid electrode and cathode material for batteries.

2. Fast ionic conductors

A series of lithium fast ion conductors have been prepared based on lithium nitride. As a fast ionic conductor material, it should have higher decomposition voltage, lower electronic conductivity, higher ionic conductivity and better chemical stability.

3. Preparation of Boron Nitride from Lithium Nitride

Lithium nitride (Lin3) is a catalyst for the synthesis of (boron nitride) CBN at high temperature and pressure. Lithium nitride catalyzes the conversion of Bn to CBN and the reaction of B4C and NH4A at atmospheric pressure and high temperature. It can also be used as a nitrogen source for solvothermal reaction with Bbr3 to generate Bn and CBn. Besides being used as a solid electrolyte, lithium nitride is also an efficient catalyst for converting hexagonal boron nitride to cubic boron nitride.

4. Using lithium nitride to prepare lithium difluorosulfinate salt.

Lithium sulfoxide (LIN(SO2F)2, hereinafter referred to as LIFSI) is a promising electrolyte. LiFSI has suitable electrical conductivity, high thermal and electrochemical stability

5. Preparation of cubic boron nitride from lithium nitride

Preparation of lithium boron nitride (Li3BN2). Li3BN2 is an important catalyst for the synthesis of cubic boron nitride superhard materials, and has been used in the industrial production of cubic boron nitride synthesis. The hardness of cubic boron nitride is lower than that of diamond, but diamond cannot be used to grind ferrous metals, so cubic boron nitride is currently the best grinding material for ferrous metals and their alloys.

Lithium Nitride Li3N Powder Price

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Technical Data of Lithium Nitride Li3N Powder