Silicon - High-tech component with maximum purity

Silicon is a classic metalloid. As a result, it exhibits both the typical properties of metals and those of nonmetals; in addition, it is also known as a single-element semiconductor because this semiconductor consists of only one element. Pure silicon forms dark gray, metallic, shiny crystals that have a diamond-like lattice structure. This explains its relatively high level of hardness.

Silicon is characterized by its excellent thermal conductivity, which – in pure silicon – is accompanied by extremely low electrical conductivity. However the electrical conductivity of silicon increases with increasing temperature. Fundamentally, silicon is extremely inert. It is not soluble in water or acids, yet it can be dissolved into the respective silicates by hot alkaline lyes.

Silicon is the most important element in semiconductor technology.High-purity silicon (> 99.99 percent) is used in computer microchips, transistors and solar cells. In addition, silicon is also employed as a raw material in the manufacture of reaction-bonded silicon nitride (RBSN) and for the metal infiltration of high-purity silicon carbide (SiSiC).

H.C. Starck offers silicon metal powder in three qualities with a purity of at least 99.995 percent. The grades AX 20, AX 10, and AX 05 are the standard qualities – depending on fineness, which increases due to decreasing grain size.


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