There are 20 kinds of crystals, such as semiconductor crystals, magneto-optical crystal, laser crystal, crystal electro-optical, acousto-optic crystals, nonlinear optical crystals, piezoelectric crystals, pyroelectric crystals, ferroelectric crystals, scintillation crystals, insulating crystals, sensitive crystal, light yellow crystal, the superconducting crystals and multifunction crystals. If according to the lattice structure of points, they can be divided into sodium chloride structure, sphalerite structure, wurtzite structure, such as a diamond structure ~~, the concept of human cognitive process of crystals and crystal 1. related human crystals What is the process of understanding the crystal? Throughout history, mankind has been tirelessly exploring this issue. Back in the Stone Age, people will find the rules of the stones of various shapes and put them into the tool, thus opening a prelude to explore the nature of the crystal. Then, after a long-term observation, it was found that the most significant features of the crystal has a shape that is the rule. In 1669, Italian scientists Si Dannuo (Nicolaus Steno) crystal plane discovered law of conservation of angular, pointed out the same substance in the crystal, the angle between the respective crystal surface is constant. Then energy efficiency, according to French scientists 阿羽 (Rene Just Haüy) made famous lattice theory in 1784, so our understanding of the crystal a big step. According to this doctrine, the unit cell is the smallest unit of the crystal constituting the crystal is formed by the accumulation of a large number of cell. In 1885, this doctrine was the country's scientists Bravais (A.Bravais) develop into a silicon carbide space lattice theory that crystals composed of atoms, molecules or ions are arranged according to certain rules, which are arranged to form a certain form The space lattice structure. In 1912, German scientist Laue (Max van Laue) crystal X-ray diffraction experiments carried out, for the first time confirmed the correctness of this doctrine, and thus won the Nobel Prize in Physics. Common Yue Crystal Materials Co., Ltd. Shandong days due to a periodic crystal lattice structure of space, the crystal has the following common properties: uniformity Yue Crystal Materials Co., Ltd. Shandong days, that same macroscopic properties of crystals in different parts; anisotropy. i.e., the crystal in different directions with different physical properties; self-limiting, i.e., spontaneously formed crystal geometry rules; symmetry, i.e. identical crystal orientation in certain physical and chemical properties; having a fixed melting point; the can be minimized. In addition to crystallographic studies of the crystal structure, growth and general nature, it is also exploring other issues related to the crystal, thus forming a crystal learn this discipline. Its main contents include five parts: crystal growth, the geometry of the crystal, the crystal structure analysis, crystal chemistry and crystal physics. Including Shandong days Yue, crystal growth is artificial cultivation methods and laws crystals, is an important foundation for crystallographic studies; geometry crystals are arranged in geometric regularity of the crystal shape and internal particle theory, which belongs to the classical theory of crystallographic studies part, however, in recent years, the discovery of five second-class rotational symmetry of the classical theory that presents a challenge; crystal structure analysis is to gather a large number of the crystal structure of the diffraction data, the crystal structure of concrete and proven method of X-ray structure analysis ; relations crystal chemistry major research chemical composition and crystal structure and properties between; crystal physics is the study of the physical properties of crystals, such as optical properties, electrical properties, magnetic properties, mechanical properties, thermal properties and acoustic properties and so on. SiC | Shandong days Yue | saving provided by Jinan Spark Technology Development Company Limited. Jinan Spark Technology Development Co., Ltd. (www.sicc.cc) (www.sicc.cc) strong, credible, in Jinan, Shandong chemical equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Shandong days into the glorious mountain and you work for a better future! You can also access (www.sicc.cc/supply_details_41188440.html), for more information about the company.