Un siliciure est un composé comportant du silicium contenant des éléments électropositifs. C'est une variété silicée d'intermétallique.

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  • Un siliciure est un composé comportant du silicium contenant des éléments électropositifs. C'est une variété silicée d'intermétallique.
  • Krzemek jest to związek chemiczny krzemu i metalu używany jako materiał na kontakty w produkcji urządzeń półprzewodnikowych.Zaletą krzemków jest łączenie użytecznych cech kontaktów metalowych (relatywnie niższej oporności) oraz kontaktów polikrzemowych (uniknięcie zjawiska elektromigracji).Przykłady krzemków:TiSi2, CoSi2
  • A silicide is a compound that has silicon with (usually) more electropositive elements.Silicon is more electropositive than carbon. Silicides are structurally closer to borides than to carbides.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. Silicides of all non-transition metals, with exception of beryllium, have been described.Mercury, thallium, bismuth, and lead are nonmiscible with liquid silicon.Silicon atoms in silicides can have many possible organizations:Isolated silicon atoms: electrically conductive Cu5Si, (V,Cr,Mn)3Si, Fe3Si, Mn3Si, and nonconductive (Mg,Ge,Sn,Pb)2Si, (Ca,Ru,Ce,Rh,Ir,Ni)2SiSi2 pairs: U3Si2, Hf and Th silicidesSi4 tetrahedra: KSi, RbSi, CsSiSin chains: USi, (Ti, Zr, Hf, Th, Ce, Pu)Si, CaSi, SrSi, YSiPlanar hexagonal graphite-like Si layers: β-USi2, silicides of other lanthanoids and actinoidsCorrugated hexagonal Si layers: CaSi2Open three-dimensional Si skeletons: SrSi2, ThSi2, α-USi2A silicide prepared by a self-aligned process is called a salicide. This is a process in which silicide contacts are formed only in those areas in which deposited metal (which after annealing becomes a metal component of the silicide) is in direct contact with silicon, hence, the process is self-aligned. It is commonly implemented in MOS/CMOS processes for ohmic contacts of the source, drain, and poly-Si gate.Group 1 and 2 silicides e.g. Na2Si and Ca2Si react with water to yielding hydrogen and/or silanes. At Consumer Electronics Show (CES) 2012 a safe and eco-friendly 1Kw or 3Kw mobile phone charger with sodium silicide that runs on water has introduced for 'people who spend time away from the electricity grid'. Any type of water can be used, including salt water and it can even run on puddle water providing it isn't thickened with mud or any other sediment.The transition metal silicides are, in contrast, usually inert to aqueous solutions of everything with exception of hydrofluoric acid; however, they react with more aggressive agents, e.g. melted potassium hydroxide, or fluorine and chlorine when red-hot.When magnesium silicide is placed into hydrochloric acid, HCl(aq), the gas silane, SiH4, is produced. This gas is the silicon analogue of methane, CH4, but is more reactive. Silane is pyrophoric, that is, due to the presence of oxygen, it spontaneously combusts in air:Mg2Si(s) + 4HCl(aq) → SiH4(g) + 2MgCl2(s)SiH4 + 2O2 → SiO2 + 2H2OThese reactions are typical of a Group 2 silicide. Mg2Si reacts similarly with sulfuric acid. Group 1 silicides are even more reactive. For example, sodium silicide, Na2Si, reacts rapidly with water to yield sodium silicate, Na2SiO3, and hydrogen gas.
  • I siliciuri sono composti chimici binari formati da metalli o semimetalli e atomi di silicio. Spesso presentano un punto di fusione inferiore rispetto al metallo da cui sono formati e alcuni di essi, fra cui il disiliciuro di molibdeno, vengono usati per indurire i metalli e produrre leghe particolari, come le "Triboloy".Alcuni siliciuri di metalli di transizione sono utilizzati nell'industria microelettronica per la fabbricazione di dispositivi CMOS. Nel processo di fabbricazione il siliciuro viene deposto direttamente o ottenuto facendo reagire il metallo di transizione con il substrato di silicio con la tecnologia del saliciuro.I siliciuri non vanno confusi (come invece spesso accade) con i silicati, anch'essi composti del silicio ma a base ossidica.
  • Силици́ды — соединения кремния с менее электроотрицательными элементами (как правило, металлами). Силициды известны для щелочных и щелочноземельных металлов, большей части d-металлов и f-металлов. Be, Ag, Au, Zn, Cd, Hg и все p-элементы силицидов не образуют.
  • Silicide sind binäre metallische Verbindungen des Siliciums und werden meist den intermetallischen Verbindungen zugerechnet. Sie sind Halbleiter, weisen Metallglanz auf und kristallieren in definierten Strukturen aus. Es sind die Silicide vieler Metalle bekannt, jedoch bilden Aluminium, Antimon, Arsen, Bismut, Cadmium, Gold, Quecksilber, Ruthenium, Silber, Thorium und Zink keine Silicide.
  • Silicidy jsou sloučeniny křemíku s elektropozitivnějšími prvky.Křemík je elektropozitivnější než uhlík a silicidy jsou strukturně bližší boridům než karbidům. Silicidy, podobně jako karbidy a boridy, nejsou jednoduše tvořeny kovalentními molekulami. V silicidech se vyskytují různé vazby od vodivých kovových struktur po kovalentní či iontové.
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  • Un siliciure est un composé comportant du silicium contenant des éléments électropositifs. C'est une variété silicée d'intermétallique.
  • Krzemek jest to związek chemiczny krzemu i metalu używany jako materiał na kontakty w produkcji urządzeń półprzewodnikowych.Zaletą krzemków jest łączenie użytecznych cech kontaktów metalowych (relatywnie niższej oporności) oraz kontaktów polikrzemowych (uniknięcie zjawiska elektromigracji).Przykłady krzemków:TiSi2, CoSi2
  • Силици́ды — соединения кремния с менее электроотрицательными элементами (как правило, металлами). Силициды известны для щелочных и щелочноземельных металлов, большей части d-металлов и f-металлов. Be, Ag, Au, Zn, Cd, Hg и все p-элементы силицидов не образуют.
  • Silicide sind binäre metallische Verbindungen des Siliciums und werden meist den intermetallischen Verbindungen zugerechnet. Sie sind Halbleiter, weisen Metallglanz auf und kristallieren in definierten Strukturen aus. Es sind die Silicide vieler Metalle bekannt, jedoch bilden Aluminium, Antimon, Arsen, Bismut, Cadmium, Gold, Quecksilber, Ruthenium, Silber, Thorium und Zink keine Silicide.
  • Silicidy jsou sloučeniny křemíku s elektropozitivnějšími prvky.Křemík je elektropozitivnější než uhlík a silicidy jsou strukturně bližší boridům než karbidům. Silicidy, podobně jako karbidy a boridy, nejsou jednoduše tvořeny kovalentními molekulami. V silicidech se vyskytují různé vazby od vodivých kovových struktur po kovalentní či iontové.
  • I siliciuri sono composti chimici binari formati da metalli o semimetalli e atomi di silicio. Spesso presentano un punto di fusione inferiore rispetto al metallo da cui sono formati e alcuni di essi, fra cui il disiliciuro di molibdeno, vengono usati per indurire i metalli e produrre leghe particolari, come le "Triboloy".Alcuni siliciuri di metalli di transizione sono utilizzati nell'industria microelettronica per la fabbricazione di dispositivi CMOS.
  • A silicide is a compound that has silicon with (usually) more electropositive elements.Silicon is more electropositive than carbon. Silicides are structurally closer to borides than to carbides.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.
rdfs:label
  • Siliciure
  • Krzemki
  • Silicide
  • Silicide
  • Silicidy
  • Siliciuri
  • Силициды
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