Can silicon dioxide conduct electricity?
The chemical formula of silica is SiO2. Silicon dioxide has two forms: crystalline and amorphous. Silica in nature, such as quartz, quartz sand and so on, is called silica. Pure quartz is colorless crystal, large and transparent prismatic quartz crystal is called crystal, amethyst is purple with trace impurities, and smoky crystal is light yellow, golden yellow and brown. Chalcedony, agate and Jasper are all colored quartz crystals containing impurities. Sand is fine quartz mixed with impurities. Opal and diatomite are amorphous silica. Silica is widely used for making glass, water glass, pottery, enamel, refractories, aerogel felt, ferrosilicon, molding sand, silicon and cement. In ancient times, silicon dioxide was also used to make glaze and carcass of porcelain. General stone is mainly composed of silica and calcium carbonate.
The melting point of crystalline silica is 1723 ℃, the boiling point is 2230 ℃, and it is insoluble in water. Except for fluorine gas and hydrofluoric acid, silicon dioxide does not react with halogen, hydrogen halide and inorganic acid, but can dissolve in hot concentrated alkali, molten strong alkali or sodium carbonate. In addition, silica can be reduced by coke and magnesium at high temperature. At normal temperature, the strong alkali solution and SiO2 will react slowly to form silicate, so the glass bottle for storing the strong alkali solution cannot use the ground glass plug (SiO2 is contained in the glass), otherwise, the viscous sodium silicate Na2SiO3 will be generated, which will make the bottle plug and the bottle mouth stick together. Because SiO2 can react with hydrofluoric acid, it can not be contained in glass container.
Silicon dioxide(white carbon black) does not conduct electricity under normal circumstances,because in it no free electrons are present for conductivity. It is used as in insulator inside integrated circuits, because it can be grown on the sio2 wafer by exposing it to steam.
However it is piezoelectric, which means that if you deform it it will generate an electrical impulse; and if you apply an electrical field to it it will deform. This property allows it to be used to make resonant crystals to control the frequency of "quartz" watches, radio transmitters/receivers and other devices.
Contact Us:
JINSHA PRECIPITATED SILICA MANUFACTURING CO.LTD.
Email.: jk@jksilica.com
Add.: Gaosha Industrial Zone, Shaxian, Fujian, China
EXPORT OFFICE
Room 908, Taiwan Street No.290, Xiamen, China
Mobile/WhatsApp:+86-17850500833
Contact: Wendy Wu, Sally Jiang
Tel.:+86-592-5528715
Fax.:+86-592-5528716