We all know that diamond melts at 3550 ℃, and graphite melting point is 3652 ℃ ~ 3697 ℃ (sublimation). So graphite melting point higher than diamond. Physically it is. Inside the graphite sheet is atomic crystal, from the point of view between the sheets, graphite is a molecular crystal (generally speaking, the graphite should be mixed crystal); and diamond atomic crystals. But higher than the melting point of graphite crystal diamond, it seems irrational. But lamellar graphite crystal covalent bond length is 1.42 × 10-10m, within the diamond crystal covalent bond length is 1.55 × 10-10m. With a covalent bond, bond length is smaller, the stronger the bond, the more difficult it destroy it, it needs to provide more energy, and therefore should be higher melting point. Each layer of graphite part of a mesh, and the intermolecular forces between the layers, it is between the crystal structure and atomic crystal molecules between crystals. However, due to the covalent bond length within the graphite layer bond length than the diamond key length, the greater the intermolecular forces, the destruction of chemical bonds requires more energy. The body is mainly composed of the same elements, higher melting point than the pure substance melting point of the mixture, this is common sense. Graphite and diamond are mainly composed of C, but is a mixture of graphite, impurities, diamond is a pure substance, impurities can be ignored. Jixi Koichi New Energy Co., Ltd., specializing in the production of various types of new energy, the company's main products are: high-purity graphite, carbon graphite, carbon agent, artificial diamond, anode material, diamond tools. The company has many years of experience, reliable product quality, you are welcome to come to consultation, cooperation. 

palabras clave: Purity graphite, diamond, graphite melting point,