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 our lab, we were able to produce alkali metal silicides, which basically are made from sodium and silicon, which, in turn, are produced from salt and sand," said James Dye, SiGNa's co-founder and University Distinguished Professor of Chemistry Emeritus at MSU.
It also proves the previous assumption that the formation silicide blocks the carbide formation.
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.
According to the company, sodium silicide is "a safe, air-stable reactive metal powder" that produces hydrogen at about half the pressure of a soda can.
9 Contact resistance: This refers to contact resistance between silicon and silicide.
1997) Characterization of graded Ti silicide coating formed by thermal diffusion treatment of low pressure plasma sprayed silicon coating on titanium substrate.
The Gelest-UAIM process uses halide-based complexes for the low-temperature growth of either the transition metal (Ti or Ta) or its nitrides and/or its silicide alloys, depending on the reactants used.
11, 1993 NATURE, Browning tells how STEM and EELS permitted him to see single-atom columns at the interface between cobalt silicide and silicon.
Nanotechnology specialists from the US and Korea cover nanowire growth and integration; high performance, low power electronic devices; nanowire phase-change memory; biosensors; metal silicide nanowires and their spintronic and renewable energy applications; optoelectronic devices; and energy devices like photovoltaics, mechanical nanogenerators, thermoelectric harvesters, and lithium-ion batteries.
Among the topics are enhancing the performance of TiSi2-coated silicon nanocrystal memory devices, novel magneto-resistive structures using self-assembly and nanowires on silicon, charge storage properties of a nickel silicide nanocrystal layer embedded in silicon dioxide, key technologies for an iron RAM backend module, a simulation model of resistive switching in electrochemical metalization memory cells, field-induced crystal nucleation in chalcogenide phase change memory, and crystallization characteristics of Ge-Sb phase change materials.