Titanium disilicide

Titanium silicide ( ambiguous )

White gray to black solid

Fixed

4.02 g · cm -3

1760 ° C

Insoluble in water and mineral acids

Attention

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Titanium disilicide is an inorganic chemical compound of titanium from the group of silicides.

Production and representation

Titanium disilicide can be obtained by reaction of titanium or titanium hydride and silicon.

Also possible is the representation of aluminothermischem way by firing a mixture of aluminum powder, for example, sulfur, silica and titania or Kaliumfluortitanat K2TiF6, by electrolysis of a melt Kaliumfluortitanat and titanium dioxide or by reaction of titanium with silicon tetrachloride.

It can also be obtained by reacting titanium ( IV) chloride with monosilane, dichlorosilane, or silicon.

Properties

Titanium disilicide is a metallic luster, whitish-gray to black crystalline solid with good thermal and electrical conductivity. He has orthorhombic crystal structure with space group Fddd (a = 825.3 pm, b = 478.3 pm, c = 854.0 pm ). It is insoluble in water and mineral acids except hydrofluoric acid, slowly soluble in 10 % potassium hydroxide solution. It should be noted, that are known in addition to titanium disilicide more Titansilicide. So TiSi1, 8 with the space group Cmcm and a density of 3.9 g · cm -3, Ti3Si with a tetragonal crystal structure isotypic to that of Ti3P, isotypic Ti5Si4 with a melting temperature of 2120 ° C and a tetragonal crystal structure to that of Zr5Si4 and Titanmonosilicid TiSi having a melting point of 1760 ° C, and an orthorhombic crystal structure isotypic with that of iron boride FeB. It is also a known compound Ti5Si3.

Use

Titanium disilicide is used in the semiconductor industry (eg in the salicide process). It can be used for the cleavage of water with the help of sunlight.