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Do you know what kinds of nitrides are?

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Update time : 2021-06-11 16:16:52
Overview of Nitrides
Nitrides are binary compounds of nitrogen with fewer electronegative elements. Nitrides formed by the direct combination of transition elements and nitrogen are also called metallic nitrides. They are "mesenchymal compounds", so named because nitrogen atoms occupy interstitial positions in the crystal lattice of metals. These compounds resemble metals in appearance, hardness, and electrical conductivity. They are generally hard, have a high melting point, are chemically stable, and have electrical conductivity. Nitrogen compounds such as titanium, vanadium, zirconium and tantalum are hard and refractory and have special points such as chemical corrosion resistance and high-temperature resistance. For example, the melting point of TiN is 2 930 ~ 2 950℃, which is a good conductor of heat and electricity. It has superconductivity at low temperatures and is used in the manufacture of jet engines. ZrN is superconducting at low temperatures and is now used as a reactor material.
Nitrogen is highly electronegative and can form a series of nitrides with many less electronegative elements, including ionic nitrides, covalent nitrides and metallic nitrides.
Lonic nitride
Nitrides formed by alkali and alkaline earth metal elements belong to ionic nitrides, whose crystals are dominated by ionic bonds. Nitrogen elements exist in the form of N3-, which are also called salt-like nitrides. Currently, only Li3N is used for ionic nitrides. Li3N is a dark red solid in a hexagonal crystal system with a density of 1.27g/cm3 and a melting point of 813°C. Simple synthesis and high ionic conductivity. It can be combined with solid or liquid, lithium coexistence is one of the best solid lithium electrolytes.
Covalent nitrides
The nitrides formed by group IIIa ~ VIIa elements are covalent nitrides, and their crystals are mainly covalent bonds. Among them, the compounds composed of oxygen, VIIA group elements and nitrogen elements should be accurately called nitrogen oxides and nitrogen halides. The most widely used covalent nitrides are mainly those of group IIIa and IVA elements (such as Bn, AlN, GaN, InN, C3N4 and Si3N4). Its structural unit is similar to the tetrahedron of diamond, so it is also called diamond nitride. High hardness, high melting point, good chemical stability. Most of them are insulators or semiconductors. Widely used in cutting tools, high-temperature ceramics, microelectronic devices, luminous materials and other fields.
Metallic nitride
Nitrides formed by transition metal elements are metallic nitrides in which the nitrogen atoms are located in the gaps between cubes or hexagonal densely arranged metal lattices, and are also called filled nitrides. The chemical formula of these nitrides does not follow strict stoichiometric ratios and their composition can vary within certain limits. Most of the metal nitrides are NaCl type and the chemical formula is Mn type. Generally, with a metallic luster, good electrical conductivity, high hardness, high melting point, wear resistance and corrosion resistance and other similar metal properties. It has a good application prospect in cutting materials, electrode materials, catalytic materials, etc.
Nitrides supplier
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