Atomistry » Tungsten » Compounds » Tungsten Sesquisilicide
Atomistry »
  Tungsten »
    Compounds »
      Tungsten Sesquisilicide »

Tungsten Sesquisilicide, W2Si3

Tungsten Sesquisilicide, W2Si3, is obtained by heating a mixture, containing 10 parts of silicon and 23 parts of tungstic anhydride, in an electric furnace. The product is suspended in dilute hydrochloric acid, and the excess of free tungsten removed by electrolysis; the silicide collects at the bottom of the vessel and is treated successively with aqua regia, ammonia, and hydrofluoric acid, any carbon silicide present being finally removed by means of methylene iodide. It forms lustrous steel-grey plates, of density 10.9. It is fusible at red heat and readily oxidises; in oxygen it burns brilliantly at 500° C. The halogens attack it at comparatively low temperatures. On the other hand, it is very resistant to acids and alkalies in solution; aqua regia has practically no action, but a mixture of nitric and hydrofluoric acids decompose it even at ordinary temperatures, whilst fused alkali hydroxides and carbonates also attack it readily.

Last articles

Xe in 6AYK
Xe in 6QII
Xe in 6ASM
Xe in 5NSW
Xe in 6FY9
Xe in 5O1K
Xe in 5O27
Xe in 5M69
Xe in 5KPU
Xe in 5I63
© Copyright 2008-2020 by
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy