What is the formula for nickel silicide? Ni2Si Nickel silicide Identifiers Chemical formula Ni2Si Molar mass 145.473 g/mol Density 7.40 g/cm3 Melting point 1,255 °C (2,291 °F; 1,528 K) What is silicide chemistry? A silicide
What is the formula for nickel silicide?
Ni2Si
Nickel silicide
| Identifiers | |
|---|---|
| Chemical formula | Ni2Si |
| Molar mass | 145.473 g/mol |
| Density | 7.40 g/cm3 |
| Melting point | 1,255 °C (2,291 °F; 1,528 K) |
What is silicide chemistry?
A silicide is type of a chemical compound that combines silicon and a (usually) more electropositive elements. Similar to borides and carbides, the composition of silicides cannot be easily specified as covalent molecules. The chemical bonds in silicides range from conductive metal-like structures to covalent or ionic.
What is nickel silicon?
Nickel Silicon Carbide (CODIAC) is a regenerative layer of an electrolessly plated matrix, usually a nickel/phosphorus alloy, with finely divided particles uniformly dispersed in it. The nickel matrix alloy most commonly used is made up of 90-93% nickel and 7-10% phosphorus.
What is silicide formation?
The silicide formation technique of directly depositing a refractory metal on a silicon surface to form the required silicide layer employs the process of direct metallurgical reaction. In such a metallurgical reaction, metal-rich silicides generally form first, and continue to grow until all the metal is consumed.
Why is silicide used?
Abstract. Metallic silicides and germanides are used as contact materials on source/drain and gate in metal oxide semiconductor (MOS) structures such as transistors or memories. They are fabricated by reaction between a metal or a metallic alloy thin film and the Si (Ge) substrate.
What is silicide used for?
Silicide (compound of silicon with metal) is formed on gates (polysilicon), sources and drains (Si wafer) as three MOS transistor electrodes in order to reduce contact resistance to metal wiring layers to be formed later.
Who invented Nikasil?
Mahle
Development. Nikasil was introduced by Mahle in 1967, initially developed to allow Wankel engine apex seals (NSU Ro 80, Citroën GS Birotor and Mercedes C111) to work directly against the aluminium housing.
Why do we need silicide?
Silicide (compound of silicon with metal) is formed on gates (polysilicon), sources and drains (Si wafer) as three MOS transistor electrodes in order to reduce contact resistance to metal wiring layers to be formed later. This silicide formation also has the effect of lowering the resistance of each electrode.
What is self-aligned silicide?
The self-aligned-silicide (salicide) process is widely used in integrated circuits to reduce polysilicon gate resistance and source/drain contact resistance. First, the silicide is selectively formed on the polysilicon gate and source/drain diffused regions, while oxide or nitride can serve as a reaction mask.
What is Salicidation?
Abstract. Self-aligned silicidation is a well-known process to reduce source, drain, and gate resistances of submicron metal-oxide-semiconductor devices.
What kind of silicides are used in nickel alloys?
Additionally thin layers of nickel silicides may have application in imparting surface resistance to nickel alloys. Nickel silicides include Ni 3 Si, Ni 31 Si 12, Ni 2 Si, Ni 3 Si 2, NiSi and NiSi 2.
What is the resistivity of a nickel silicide?
Nickel silicides are generally chemically and thermally stable. They have low electrical resistivity; with NiSi 10.5–18 μΩ·cm, Ni 2 Si 24–30 μΩ·cm, NiSi 2 34–50 μΩ·cm; nickel-rich silicides have higher resistivity rising to 90–150 μΩ·cm in Ni 31 Si 12.
Can a nickel silicide be used as a hydrogenation catalyst?
NiSi has been investigated as a hydrogenation catalyst for unsaturated hydrocarbons. Nickel silicide nanoparticles supported on silica support have been suggested as an alternative catalyst to widely used pyrophoric Raney nickel.
What are the chemical bonds of a silicide?
The chemical bonds in silicides range from conductive metal-like structures to covalent or ionic. Silicides of all non- transition metals, with exception of beryllium, have been described. Silicon atoms in silicides can have many possible organizations: A silicide prepared by a self-aligned process is called a salicide.
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