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Silicon Dioxide: it is an oxide. Silicon: silicon simple substance is more lively and a non-metallic elements, stable elements and can form compounds with 96 kinds of 64 kinds of elements. The main purpose is determined by its silicon semiconductive. Silicon material is the most important semiconductor material. is a chemical element with symbol Si and atomic number 14. It is a tetravalent metalloid, more reactive than germanium, the metalloid directly below it in the table. Controversy about silicon's character dates to its discovery. It was first prepared and characterized in pure form in 1823.

Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in the Earth's crust. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates. Over 90% of the Earth's crust is composed of silicate minerals, making silicon the second most abundant element in the Earth's crust (about 28% by mass) after oxygen. Most silicon is used commercially without being separated, and often with little processing of the natural minerals. Such use includes industrial construction with clays, silica sand, and stone. Silicate is used in Portland cement for mortar and stucco, and mixed with silica sand and gravel to make concrete for walkways, foundations, and roads. Silicates are used in whiteware ceramics such as porcelain, and in traditional quartz-based soda-lime glass and many other specialty glasses. Silicon compounds such as silicon carbide as used as abrasives and components high-strength ceramics.Silicon is the basis of the widely used synthetic polymers called silicones.

Silicon Dioxide is common use in many field. Crystal relatively rare in nature which can be used to manufacture key components of the electronics industry, optical instruments and crafts. Silicon Dioxide is an important raw material to manufacture optical fiber. Generally, pure quartz can make quartz glass. Quartz glass expansion coefficient is small, equivalent to 1/18 of ordinary glass, can withstand drastic changes in temperature, good acid resistance (except HF outside), therefore, the quartz glass used to manufacture high-temperature chemical equipment.



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