Silicon Metal Of 441

Silicon is one of the semi-metals, formerly known as "silicon". The melting point is 1420 °C and the density is 2.34 g/cm3. Hard and brittle. It is insoluble in acid at room temperature and easily soluble in alkali. The properties of silicon metal are similar to those of germanium, lead, and tin, and it has semiconductor properties. Silicon is extremely abundant in the earth's crust, second only to oxygen, and accounts for more than a quarter of the total weight of the earth's crustsilicon dioxideor in silicate form. The purest silica mineral is quartz or silica. Silicon has two allotropes: one is a dark brown amorphous powder that is active and can be burned in air; The other is a crystal with stable properties (crystalline silicon). Generally, silica and quartz are used in glass and other building materials, and high-quality quartz is used to make alloys, metals and single crystals.

The classification of silicon metal is usually classified according to the content of the three main impurities contained in the composition of silicon metal: iron, aluminum, and calcium. According to the content of iron, aluminum and calcium in silicon metal, silicon metal can be divided into 553, 441, 411, 421, 3303, 3305, 2202, 2502, 1501, 1101 and other different grades.

Silicon metal is mainly composed of silicon, so it has similar properties to silicon. There are two allotropic forms of silicon: amorphous silicon and crystalline silicon. Amorphous silicon is a grayish-black powder that is actually also a microcrystalline. Crystalline silicon has the crystal structure and semiconductor properties of diamond, melting point 1410 °C, boiling point 2355 °C, Mohs hardness 7, brittleness. Amorphous silicon is chemically active and can burn violently in oxygen. It reacts with non-metals such as halogen, nitrogen, and carbon at high temperatures, and can also react with metals such as magnesium, calcium, and iron to form silicides.

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