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Applications of Silicon
Silicon is one of man’s most useful
elements. In the form of sand and clay it is used to make concrete and brick; it
is a useful refractory material for high-temperature work, and in the form of
silicates it is used in making enamels, pottery, etc. Silica, as sand, is a
principal ingredient of glass, one of the most inexpensive of materials with
excellent mechanical, optical, thermal and electrical properties. Hyperpure
silicon can be doped with boron, gallium, phosphorus, or arsenic to produce
silicon for use in transistors, solar cells, rectifiers, and other solid-state
devices, which are used extensively in the electronics and space-age industries.
Though silicon was originally discovered in 1810 and thought to be a
compound silicon was discovered as an element in 1823 by Jons Berzelius. In 1824
Berzelius prepared amorphous silicon by the same general method and purified the
product by removing the fluosilicates by repeated washings. Deville in 1854
first prepared crystalline silicon, the second allotropic form of the element.
Davy in1800 thought silica to be a compound and not an element; later in 1811,
Gay Lussac and Thenard probably prepared impure amorphous silicon by heating
potassium with silicon tetrafluoride.
Silicon is a metalloid at room
temperature with an atomic number of 14, 14 electrons, 14 neutrons, and an
average atomic mass of 28.0855. In its pure form,silicon melts at 2,570 degrees,
and boils at 4,271 degrees Fahrenheit. This element belongs to the metalloid
family, the 14th family on the periodic table of elements. This element is a
solid metalloid at room temperature and turns to liquid at 2,570 degrees.
Silicon is prepared as a brown amorphous powder or as gray-black crystals.
Crystalline silicon has a metallic luster and grayish color. It is hard,
non-magnetic, and most acids do not effect it, but it does dissolve in
hydrofluoric acid, forming the gas, silicon tetrafluoride, SiF 4. At ordinary
temperatures silicon is impervious to air, but at high temperatures it reacts
with oxygen, forming a layer of silica that does not react further. At high
temperatures it also reacts with nitrogen and chlorine to form silicon nitride
and silicon chloride, respectively. Elemental silicon transmits more than 95% of
all wavelengths of infrared, from 1.3 to 6.y micro-m.
Silicon is present in
the soil and makes up about 25.7% of the earth’s crust. Silicon also promotes
firmness and strength in human tissues. It is part of the arteries, tendons,
skin, connective tissue, and eyes. This mineral is also present with the
chondroitin sulfates of cartilage, and it works with calcium to help restore
bones. Silicon is also thought to radiate or transmit energy in its crystalline
structure, as in quartz crystal. It is thought by some to be able to deeply
penetrate the tissues and help to clear stored toxins. Research shows silicon is
important to plant and animal life. Results of studies on animals suggest that
silicon may be essential to humans. This mineral is able to form long molecules,
much the same as is carbon, and gives these complex configurations some
durability and strength. It represents about 0.05 percent of our body weight.
Silicon is present in the sun and stars and is the second most abundant
element, being exceeded only by oxygen. Silicon is not found free in nature, but
occurs chiefly as the oxide and as silicates. Sand, quartz, rock crystal,
amethyst, agate, flint, jasper, and opal are some of the forms in which the
oxide appears. Granite, hornblende, asbestos, feldspar, clay, mica, etc. are but
a few of the numerous silicate minerals. Silicon is prepared commercially by
heating silica and carbon in an electric furnace, using carbon electrodes.
Several other methods can be used for preparing the element. Amorphous silicon
can be prepared as a brown powder, which can be easily melted or vaporized. The
Czochralski process is commonly used to produce single crystals of silicon used
for solid-state or semiconductor devices. Hyperpure silicon can be prepared by
the thermal decomposition of ultra-pure trichlorosilane in a hydrogen
atmosphere, and by a vacuum float zone process.