Silicide


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silicide

[′sil·ə‚sīd]
(chemistry)
A binary compound in which silicon is bonded with a more electropositive element.

Silicide

 

any of the chemical compounds of silicon with metals and certain nonmetals. Suicides can be divided into three basic groups according to the type of chemical bond: ionic-co-valent, covalent, and metallic. Ionic-covalent suicides are formed from alkali metals (with the exception of sodium and potassium), alkaline-earth metals, and metals of the copper and zinc subgroups. Covalent suicides are formed from boron, carbon, nitrogen, oxygen, phosphorus, and sulfur and can be referred to as, for example, borides, carbides, and nitrides of silicon. Metallic silicides are formed from transition metals.

Suicides are obtained by fusing or sintering a powdery mixture of Si and a given metal or by heating metal oxides with Si, SiC, SiO2, and natural or synthetic silicates (sometimes mixed with carbon). Other methods include the interaction of a metal with a mixture of SiCl4 and H2 and the electrolysis of melts composed of K2SiF6 and an oxide of a given metal.

Covalent and metallic suicides, in addition to being refractory, are resistant to oxidation and the action of mineral acids and various aggressive gases. Suicides are used in heat-resistant cermet composition materials in aviation and rocket engineering. MoSi2 is used in the manufacture of heaters for furnaces heated by electrical resistance and operating under exposure to air at temperatures up to 1600°C. FeSi2, Fe3Si2, and Fe2Si are constituents of ferrosilicon, which is used in the deoxidation and alloying of steel. Silicon carbide is a semiconductor material.

REFERENCES

Nekrasov, B. V. Osnovy obshchei khimii, 3rd ed., vols. 1-2. Moscow, 1973.
Gel’d, P. V., and F. A. Sidorenko. Silitsidy perekhodnykh metallov chetvertogo perioda. Moscow, 1971. [23–1081–]
References in periodicals archive ?
McDeavitt, "Development of a high density uranium nitride-uranium silicide composite accident tolerant fuel," in Proceedings of the 2014 Annual Meeting on Transactions of the American Nuclear Society and Embedded Topical Meeting: Nuclear Fuels and Structural Materials for the Next Generation Nuclear Reactors, NSFM 2014, pp.
In [16], a drawback of employing silicide is highlighted which is due to the drop of potential on the drain side.
Recombination at iron silicide precipitates also contributes to the charge carrier lifetime by the following expression [15]:
The source of these cartridges is called sodium silicide.
But, the range extending system that SiGNa developed uses a sandy metal powder called sodium silicide, which creates hydrogen gas as soon as water hits it, the report say.
Chemical Supplier Country of Origin Barium nitrate Barium and China Chemicals Calcium silicide Perkins Rouge Brazil Magnesium oxide Matrixchem Mexico Calcium resinate-fused Barium and United Chemicals States/China/Europe/India Potassium perchlorate Hummel China Crouton Strontium nitrate Barium and China Chemicals Strontium oxalate Barium and United Chemicals States/China/Europe/India Strontium peroxide Hummel Mexico/United States Crouton Magnesium aluminum alloy Reade United States Manufacturing Calcium Hummel Mexico resinate-peripiated Crouton Magnesium carbonate Matrixchem United States Barium nitrate Barium and China Chemicals Ammonium nitrate Dyno Nobel United States The primer mix chemicals, the suppliers of those chemicals to ATK, and the country of origin of the chemicals.
uses platinum silicide forward-looking infrared and high resolution
The test castings were poured in C [O.sup.2]--sodium silicide moulds, knocked out, risers were removed and then subjected to normalising, tempering sort of heat treatments and various material properties such hardness, passion ratio and so on were also studied and appropriate selection has been done.
After the decomposition, the silicon could diffuse out into Nb film to form niobium silicide. The driving force for silicon diffusion out is believed to originate from the negative Gibbs free energy of Nb silicide formation (Fig.
The 65nm MTP process is built up to 10 metal layers using copper low-k interconnects and nickel silicide transistor interconnects.
An IR camera equipped with an FPA detector made from platinum silicide (PtSi) material was used.