Silicon

Generally present as a silicate, these being found in many rocks, clays and soils. Silicon is obtained by reducing silica (sand, SiO2 ), with carbon. Further purification of the element for applications requiring high purity material (e.g. semi conductor devices) is achieved by zone refining, the resulting purity being better than 1:109. Silicon exists in two allotropic forms; brown silicon is a powder, whereas crystalline (metallic) silicon is grey and it is the latter which is more widely used. Bulk silicon is unreactive towards oxygen, water, acids (excluding HF), but is soluble in hot alkalis. Silicon has many applications in various industries; for example, ultra high purity silicon is used in the semiconductor industry as a result of its semiconducting properties. Silicon is also used as an alloying element in the manufacture of certain alloys (e.g. ferrosilicon, an alloy of iron and silicon which is used to introduce silicon into steel and cast iron). It is also used in the manufacture of glass.


Symbol
Si

Discovered
1824 by J.J. Berzelius in Stockholm, Sweden.

Abundance
After carbon, silcon is the most abundant element on earth, the abundance being 277,000 ppm. Found in sand and quartz (as the oxide).

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Atomic number 14 Clip
Atomic / Molecular Weight 28.0855 gmol-1Clip
Density 2329 kgm-3Clip
Lattice constant 543 fmClip
Melting Point 1683 KClip
Boiling Point 3473 KClip
Linear expansivity 0.0000026 K-1Clip
Specific heat capacity 711 Jkg-1K-1Clip
Bulk Modulus of Rigidity 100000000000 Nm-2Clip
Electromotive Series -0.26 VClip
Electrical Conductivity 0.00156 Sm-1Clip
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See also: Berzelius, Jons Jakobs, Boule, Periodic Table, SiH4, Silane, Silicon Carbide, Silicon Dioxide, Silicon Iron, Silicon Nitride.

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Subjects: Chemistry