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 ?
In the silicide process, pretreatment (an interface) is extremely important, and dry pretreatment is preferable as a damage-free pretreatment.
By adding water to sodium silicide, we're able to produce hydrogen, which creates energy for fuel cells.
It indicates that the silicon diffusion-out is limited and that the silicide layer is pretty thin.
After its identification, the manganese silicide became mineral number 4,325, according to the International Mineralogical Association, which christened it Brownleeite after Donald E.
IT'S YOUR CHOICE CHOOSE THE CORRECT ANSWER TO THESE QUESTIONS: 1 Conventional Earth science theory holds that Earth's inner core consists mostly of A nickel silicide C uranium B crystallized iron D helium 2 To reach their conclusions about the composition of Earth's inner core, geophysicists study A topographical maps B sound waves C earthquake waves D soil from other planets 3 Which of the following do two new inner core theories agree on?
The 3000 series offers fast ramp capability, along with the extension of the temperature measurement and control range down to lower temperatures, allowing them to address the stringent processing requirements for ultra-shallow junction and silicide formation.
Tenders are invited for Supply of MATERIALS Boron Silicide powderBoron Silicide (B6Si) powder, -200 mesh, purity 98%,Graphite powderGraphite powder, -20 %2B80 mesh, purity 99.
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, reports Discovery News.
Fujitsu Laboratories discovered that implanting aluminum after forming silicide(8) reduces contact resistance(9) between NMOS silicide and silicon.
Sources of nickel and titanium are nickel bonds of the plasma coating and complex silicide [Ni.
Other special deoxidizers such as calcium (Ca) silicon (Si), Ca manganese Si, Ca silicide, and ferrotitanium may be added with the Al.
11, 1993 NATURE, Browning tells how STEM and EELS permitted him to see single-atom columns at the interface between cobalt silicide and silicon.