Explanation

It is also called rock salt structure. A type of AB type compound structure represented by NaCl. It belongs to cubic crystal system, face centered cubic lattice, and the space group is Fm3m. Cation (Na+) and anion (Cl -) are respectively located at the node of the face centered cubic lattice, and the two lattices are 1/2 unit cell of crystal degrees apart. Among them, anion B is arranged in a square close packed trifoliate orange, and cation A is filled in the octahedral space formed by anion. The coordination number number of A and B is 6. Sulfides and oxides of alkaline earth metals (magnesium oxide to barium oxide, except beryllia); The hydrides and halides of alkali metals (except cesium chloride, cesium bromide and cesium iodide), as well as the oxides of some bivalent transition elements (such as manganese oxide, ferrous oxide, titanium oxide and nickel oxide), all have a rock salt structure, in which the connection between A-B is a ionic bond. A. B The ratio of ionic radius is mostly between 0.732-0.414. In addition, some nitrides and carbide [such as nitriding (ScN) and titanium carbide (TiC)] also belong to sodium carbide type structure. Among them, LiF, NaF, etc. are the main raw materials for glass and ceramics sintering additive. MgO, TiC, TiN, etc. are very important high-temperature materials.

Classification