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Tungsten silicide

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Tungsten silicide

Tungsten disilicide[1]
Identifiers
CAS number 12039-88-2 YesY
PubChem 16212546
Jmol-3D images Image 1
Properties
Molecular formula WSi2
Molar mass 240.011 g/mol
Appearance blue-gray tetragonal crystals
Density 9.3 g/cm3
Melting point

2160°C

Solubility in water insoluble
Hazards
EU Index not listed
NFPA 704
0
1
0
Flash point Non-flammable
Related compounds
Other anions Tungsten carbide
Tungsten nitride
Other cations Molybdenum disilicide
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Tungsten disilicide, or just tungsten silicide (WSi2) is an inorganic compound, a silicide of tungsten. It is an electrically conductive ceramic material.

Chemistry

Tungsten silicide can react violently with substances such as strong acids, fluorine, oxidizers, and interhalogens.

Applications

It is used in microelectronics as a contact material, with resistivity 60–80 μΩ cm; it forms at 1000 °C. It is often used as a shunt over polysilicon lines to increase their conductivity and increase signal speed. Tungsten silicide layers can be prepared by chemical vapor deposition, e.g. using monosilane or dichlorosilane with tungsten hexafluoride as source gases. The deposited film is non-stoichiometric, and requires annealing to convert to more conductive stoichiometric form. Tungsten silicide is a replacement for earlier tungsten films.[2] Tungsten silicide is also used as a barrier layer between silicon and other metals, e.g. tungsten.

Tungsten silicide also finds use in microelectromechanical systems and for oxidation-resistant coatings.

Films of tungsten silicide can be plasma-etched using e.g. nitrogen trifluoride gas.

References

Template:Tungsten compounds

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