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Silicon tetrafluoride

 

 
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Silicon tetrafluoride
 
 
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Silicon tetrafluoride or Tetrafluorosilane is the chemical compound
Chemical compound

A chemical compound is a Chemical substance consisting of two or more different chemical element Chemical bond together in a fixed mass ratio that can be split into simpler substances....
 with the formula Si
Silicon

Silicon is the most common metalloid. It is a chemical element, which has the symbol Si and atomic number 14. The atomic mass is 28.0855....
F
Fluorine

Fluorine is the chemical element with the symbol F and atomic number 9. Fluorine forms a single bond with itself in elemental form, resulting in the diatomic F2 molecule....
4. This tetrahedral molecule is striking because it has a remarkably narrow liquid range (its boiling point is only 4 °C above its melting point). It was first synthesized by John Davy
John Davy (chemist)

John Davy Fellow of the Royal Society was a British doctor, amateur chemist, and brother of the noted chemist Sir Humphry Davy, and cousin of Edmund Davy....
 in 1812.

sub>4 is a by-product of the production of phosphate
Phosphate

A phosphate, an inorganic chemical, is a Salt of phosphoric acid. Inorganic phosphates are mining to obtain phosphorus for use in agriculture and industry....
 fertilizer
Fertilizer

Fertilizers are chemical compounds given to plants to promote growth; they are usually applied either through the soil, for uptake by plant roots, or by foliar feeding, for uptake through leaves....
s, resulting from the attack of HF
HF

HF, Hf or hf can refer to:*Houseman & Falshaw Ltd, A British Construction Company*Hafnium, a chemical element*Hartree-Fock, a calculation scheme...
 (derived from fluorapatite
Fluorapatite

Fluorapatite, often with the alternate spelling of fluoroapatite, is a mineral with the formula Ca53F . Fluorapatite is a hard crystalline solid....
 protonolysis) on silicate
Silicate

A silicate is a compound containing an anion in which one or more central silicon atoms are surrounded by electronegative ligands. This definition is broad enough to include species such as hexafluorosilicate , [SiF6]2-, but the silicate species that are encountered most often consist of silicon with oxygen as the ligand...
s.






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Encyclopedia


Silicon tetrafluoride or Tetrafluorosilane is the chemical compound
Chemical compound

A chemical compound is a Chemical substance consisting of two or more different chemical element Chemical bond together in a fixed mass ratio that can be split into simpler substances....
 with the formula Si
Silicon

Silicon is the most common metalloid. It is a chemical element, which has the symbol Si and atomic number 14. The atomic mass is 28.0855....
F
Fluorine

Fluorine is the chemical element with the symbol F and atomic number 9. Fluorine forms a single bond with itself in elemental form, resulting in the diatomic F2 molecule....
4. This tetrahedral molecule is striking because it has a remarkably narrow liquid range (its boiling point is only 4 °C above its melting point). It was first synthesized by John Davy
John Davy (chemist)

John Davy Fellow of the Royal Society was a British doctor, amateur chemist, and brother of the noted chemist Sir Humphry Davy, and cousin of Edmund Davy....
 in 1812.

Preparation

SiF4 is a by-product of the production of phosphate
Phosphate

A phosphate, an inorganic chemical, is a Salt of phosphoric acid. Inorganic phosphates are mining to obtain phosphorus for use in agriculture and industry....
 fertilizer
Fertilizer

Fertilizers are chemical compounds given to plants to promote growth; they are usually applied either through the soil, for uptake by plant roots, or by foliar feeding, for uptake through leaves....
s, resulting from the attack of HF
HF

HF, Hf or hf can refer to:*Houseman & Falshaw Ltd, A British Construction Company*Hafnium, a chemical element*Hartree-Fock, a calculation scheme...
 (derived from fluorapatite
Fluorapatite

Fluorapatite, often with the alternate spelling of fluoroapatite, is a mineral with the formula Ca53F . Fluorapatite is a hard crystalline solid....
 protonolysis) on silicate
Silicate

A silicate is a compound containing an anion in which one or more central silicon atoms are surrounded by electronegative ligands. This definition is broad enough to include species such as hexafluorosilicate , [SiF6]2-, but the silicate species that are encountered most often consist of silicon with oxygen as the ligand...
s. In the laboratory, the compound is prepared by heating BaSiF6 >300 °C, whereupon the solid releases volatile SiF4, leaving a residue of BaF2. The required BaSiF6 is prepared by treating aqueous fluorosilicic acid
Dihydrogen hexafluorosilicate

Hexafluorosilicic acid is the chemical compound with the formula H2SiF6. Hexafluorosilicic acid refers to an equilibrium mixture with hexaflurorosilicate anion in an aqueous solution or other solvents that contain strong proton donors at low pH....
 with barium chloride
Barium chloride

Barium chloride is the ionic chemical compound with the chemical formula BaCl2. It is one of the most important water-soluble salts of barium....
. The corresponding GeF4 is prepared analogously, except that the thermal "cracking" requires 700 °C.

Uses

This volatile
Volatility (chemistry)

Volatility in the context of chemistry, physics and thermodynamics is a measure of the tendency of a substance to vaporize. It has also been defined as a measure of how readily a substance vaporizes....
 compound finds limited use in microelectronics and organic synthesis
Organic synthesis

Organic synthesis is a special branch of chemical synthesis and is concerned with the construction of organic compounds via organic reactions. Organic_chemistry molecules can often contain a higher level of complexity compared to purely Inorganic_chemistry compounds, so the synthesis of organic compounds has developed into one of the most im...
.

Occurrence


Vulcanic plumes contain significant amounts of silicon tetrafluoride, the daily production can reach several tonnes per day. The silicon tetrafluoride is partly hydrolysed and forms hexafluorosilicic acid.