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Nitrides formed from alkali metals or alkaline Earth metal elements are called ionic. They have crystals that are mostly ionic, while nitrogen is in the form N3+, which is also known by the name salt-like nitrides. Li3N, the only ionic nitride currently used, is a deep red solid. Li3N belongs to the hexagonal crystalline system and is a red solid with a density of 1.27g/cm3 as well as a melting point 813degC. It is very easy to synthesize, and it has a good ionic conductivity. It can be combined either with solids or liquids. Coexistence of Lithium is one of best solid lithium electrodes currently available.
Covalent nitrides are formed when group IIIAVIIA element are combined. The majority of their crystals consist of covalent bonding. Nitrogen oxides and nitrogen halos are the correct names for compounds that oxygen, group VIIIA elements and nitrogen form. Covalent nitrides (such as AlN, GaN and InN) are the most commonly used. The unit of structure is similar to that of a diamond tetrahedron, and so is known as class Diamond nitride. They are hard, have a high melting temperature, and exhibit good chemical stability. The majority of them are semiconductors or insulators. They are widely used for cutting tools and high-temperature ceramics.
These nitrides form by transition metal elements are metallic nitrides. The nitrogen atoms in these nitrides can also be called infill nitrides. This type of metal-type nitride is not a stoichiometric nitride, but its chemical composition may vary in a given range. Most metal-types nitrides have a NaCl type of structure and the chemical formula MN. In general, it is a metal-like material with properties such as high conductivity and hardness, a high melting point, wear resistance resistance, corrosion resistant, etc. It has many applications in the fields of cutting materials as well as electrode materials and catalyst materials.
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