The main component of synthetic diamond

synthetic diamond commonly known as "diamond." That is, we often say that the diamond, it is a mineral composed of pure carbon, is the hardest substance in nature.
The composition and crystal structure of diamond polycrystalline diamond mainly of carbon (C), the amount of C 96% -99.9%. Even a pure diamond is 0.001% of the impurities. Impurities

in the diamond component has a Si, Al, Ca, Mg, Mn, Ti, Cr, N and so on. Other than N, the other miscellaneous

Quality mineral inclusions are usually in the form of diamonds often contain magnetite, ilmenite, pyrope, chrome diopside, olivine, graphite and other mineral

inclusions. Nitrogen (N) is an important impurity in diamond components, N in the diamond crystal structure composed of various defects

Centers can be a single N, A center, B centers, N3 small wafer or the like form. According to the N content and coalescence forms can be divided into diamond type Ⅰ

and Ⅱ. Ⅰ type diamond N content higher (0.05% -0.3%). Type Ⅰ a small diamond chips N3 N to form, Ⅰ b

N-type diamond paramagnetic dispersed state exists in the way. Ⅱ type diamond containing the N of less (<0.05%), N exist in a free state. Ⅰ and type Ⅱ diamonds in

certain physical properties differ. Most natural diamonds are type Ⅰ diamonds. Diamonds equiaxed

, The crystal structure of fcc lattice with lattice parameters a ° = 3.56A (1A = 1mm / 1 ten million) (see left). C atoms are located at the top corners cubic unit

cell of eight and six face center, and in its eight small standing white checkered center half is distributed with four C atoms, each of the original C

Sub are four C atoms and the surrounding connected between every two adjacent C-atoms are equal distance (1.54A). This structure formed between the C atom of an

extremely strong covalent bond, chemical bond to separate this large amount of energy to be given. This determines the diamond has some special

Special properties, such as high hardness and chemical stability. The most common crystalline diamond octahedral, rhombic dodecahedron followed, less common is the

cube.