TITANIUM SILICIDE Property

Melting point:

1540°C

Boiling point:

1540°C

Density 

4,39 g/cm³

RTECS 

XR2420000

solubility 

insoluble in H2O, acid solutions, alkaline solutions; soluble in HF

form 

Powder

color 

Gray

Resistivity

123 (ρ/μΩ.cm)

Water Solubility 

Soluble in hydrofluoric acid. Insoluble in water.

Crystal Structure

Orthorhombic

EPA Substance Registry System

Titanium silicide (TiSi2) (12039-83-7)

Safety

RIDADR 

UN3178

TSCA 

Yes

HazardClass 

4.1

PackingGroup 

III

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Hazard statements

H228Flammable solid

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P405Store locked up.

TITANIUM SILICIDE Chemical Properties,Usage,Production

Chemical Properties

orthorhombic black powder(s), a=0.8236 nm, b=0.4773nm, c=0.8523 nm; hardness 4.5 Mohs; resistivity 123μοhm· cm can be prepared by reaction of the elements; used in special alloy applications, as a flame-resistant coating material, also as 99.5 or 99.9% pure material, as a sputtering target in the fabrication of integrated circuits [HAW93] [STR93] [CER91]

Uses

Titanium silicide is used in the semiconductor industry. It is also used in the fabrication of transistors.

Uses

In special alloy applications, as a flame or blast impingement-resistant coating material.

Synthesis

(1) PREPARATION FROM THE ELEMENTS
Ti + 2 Si = TiSi2
The silicides are prepared by fusing or sintering intimate stoichiometric mixtures of the elements (in powder form). The reaction is carried out in sintered clay or ceramic crucibles, placed in a Tammann furnace under a blanket of Ar. In all three cases the reaction takes place at a relatively low temperature and is highly exothermic; therefore, one should work with gram quantities only.
(2) ALUMINOTHERMIC METHOD
Ignition of a mixture of, for example, 200 g. of Al powder, 250 g. of S, 180 g. of SiOa and 15 g. of TiO2 (or 40 g. of K2TiF6 ), covered with a thin layer of Mg, yields an ingot containing, in addition to Si and Al, small, iron-gray tetragonal pyramids of TiSi2 .
(3) ELECTROLYTIC PREPARATION
The pure, crystalline silicides ar e obtained by melt electrolysis of a mixture of, for example, 10K2SiF6 + TiO2 at about 900°C, using an iron cathode; alternately, electrolysis of TiO2 dissolved in a melt of silicate may be used.