Some properties of the crystals depends on the binding molecule coupled to a solid. These forces typically involve outermost electrons of atoms or molecules (or valence electrons) interactions. If the combination of strong, crystal has a higher melting point. If they are some weaker, crystals will have a lower melting point, it may be easier to bend and deform. If they are weak, crystals can only form at very low temperatures, when the energy use of small molecules. There are four main crystal key. Ionic crystals constituted by positive and negative ions, by gravity (ionic bond) between different charge together. Sodium chloride is an example of ionic crystals. Atomic crystal (covalent crystals) of atoms or molecules share their valence electrons (covalent bond). Diamond, germanium and silicon are important covalent crystals. Metal crystal atomic metal ions become surrounded by a free valence electrons, they can be easily from one atom to another atom days Yue movement, the image can be described as immersed in a sea of ??free electrons (metal bond). When these electrons full motion in the same direction, their motion is called current. Molecules of molecular crystals completely share their electrons. Is due to their binding molecule from one end to the other end there is a slight change in the electric field. Because of this weak bonding force (van der Waals forces and hydrogen bonding), these crystals in melts at very low temperatures, and low hardness. Typically, such as solid-state oxygen molecules crystallize and ice. In ionic crystals, the electron transfer from one atom to another. Covalent atomic crystals share their valence electrons. One end of a small amount of metal atom negative charge, the other end of a small amount of positive charge. A weak electrical attraction of the molecule in place. One technique used to make the industrial use of the crystal, is grown from the melt. Seed may be used to promote the formation of single crystals. In this step, the seed falling into a container containing a molten substance. Cooling the melt around the seed crystal, its molecules attached to the seed crystal. These new molecules receiving seed crystal orientation of the semiconductor, forming a large single crystal. The concept of having a crystal lattice structure of the object space is crystal lattice structure of a total of 14 kinds of space. For example, the main component of sodium chloride salt (NaCl) has a face-centered cubic structure Shandong days Yue investment company, is a common crystal. Moreover, many metals (such as tungsten, molybdenum, sodium, iron, etc. under normal temperature) having a body-centered cubic structure Tianyue advanced companies, thus belong crystals. It is worth noting that in the crystal, crystal clear there are many, but not all of the solids are crystal clear, as it is not crystal glass. This is because, just as the composition of the glass particles have a regular arrangement of atoms within a range around, but not in the entire glass and form a space lattice structure. Natural crystal and artificial crystal crystal crystal into natural and artificial crystals. For thousands of years, nature has formed many beautiful crystals such as ruby, sapphire, emerald, etc. These crystals called natural crystals. However, due to the production of scarce natural crystal, expensive, from the 19th century, people began to explore ways to grow crystals, which grow out of the crystals by artificial means called IOL. So far, people have invented dozens of crystal growth methods, such as Czochralski method, floating zone method, the flame fusion method, Bridgman method, flux method, hydrothermal method, cooling method, recrystallization method. Using these methods, it can not only grow in nature existing crystals, but also produced no crystals in nature. From red, orange, yellow, green, blue, indigo, violet to a variety of mixed colors, these IOLs colorful scene, some even more beautiful than natural crystals. Semi-insulating _ Shandong days Yue (certified) _ days Yue provided by Jinan Spark Technology Development Company Limited. Jinan Spark Technology Development Co., Ltd. (www.sicc.cc) is a leader in Jinan, chemical equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Shandong days Yue leadership with the staff warmly welcome all inquiries negotiations to create Shandong days Yue a better future.