What is silicon dioxide?
Silicon dioxide is an inorganic compound with the chemical formula of SiO2. Silicon and oxygen atoms are arranged in a long-range orderly manner to form crystalline silicon dioxide, while short-range ordered or long-range disordered arrangements form amorphous silicon dioxide. In silicon dioxide crystals, silicon atoms are located at the center of a regular tetrahedron, and four oxygen atoms are at the four top corners. Oxygen atoms connect many such tetrahedrons at the top corners. Two tetrahedrons share each oxygen atom; each oxygen atom is combined with two silicon protons. The simplest formula for silicon dioxide is SiO2, but SiO2 does not represent a simple molecule (only the ratio of the number of atoms of silicon and oxygen in the silicon dioxide crystal). Pure natural silicon dioxide crystal is a hard, brittle, insoluble, colorless, and transparent solid commonly used to manufacture optical instruments.
Chemical properties of silicon dioxide
The chemical properties are relatively stable. Does not react with water. It has high fire resistance, high-temperature resistance, low coefficient of thermal expansion, high insulation, corrosion resistance, piezoelectric effect, resonance effect, and unique optical characteristics. [11] It is an acidic oxide that does not react with ordinary acids. Hydrofluoric acid reacts with silicon dioxide to produce gaseous silicon tetrafluoride. React with a hot concentrated alkali solution or molten alkali to produce silicate and water. React with various metal oxides at high temperatures to form silicates. Silicon dioxide is inert and does not react with halogens, hydrogen halides, sulfuric acid, nitric acid, and perchloric acid (except for hot concentrated phosphoric acid), except for fluorine and hydrogen fluoride. The common concentrated phosphoric acid (or pyrophosphoric acid) can corrode silicon dioxide at high temperatures, generating hetero-poly acids. Molten borate or boron anhydride can also corrode silicon dioxide at high temperatures. Due to this property, borate can be used as a flux in ceramic firing. In addition, hydrogen fluoride can also dissolve silicon dioxide into acids, generating water-soluble fluorosilicic acid.
Material structure of silicon dioxide
Silicon and carbon have similar properties, but their oxide properties differ greatly. CO2 is a molecular crystal, while SiO2 is an atomic crystal. SiO2 is a three-dimensional network structure formed based on a silicon-oxygen tetrahedron. In the crystal structure, four valence electrons of silicon atoms form four covalent bonds with four oxygen atoms, with Si atoms at the center of the regular tetrahedron and O atoms at the apex of the tetrahedron. Each silicon atom is connected to four oxygen atoms, and each oxygen atom is connected to two silicon atoms. The smallest ring in the crystal consists of 12 atoms (6 silicon atoms and 6 oxygen atoms), each shared by 6 rings. The number ratio of silicon to oxygen atoms in the crystal is 1:2.
Price of silicon dioxide
Silicon dioxide particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of silicon dioxide. A large amount of large amount will be lower. The Price of molybdenum silicide is on our company's official website.
Silicon dioxide supplier
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