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ChemicalBook--->CAS DataBase List--->12039-88-2

12039-88-2

12039-88-2 Structure

12039-88-2 Structure
IdentificationBack Directory
[Name]

TUNGSTEN SILICIDE
[CAS]

12039-88-2
[Synonyms]

TUNGSTEN SILICIDE
TUNGSTEN DISILICIDE
TUNGSTEN SILICIDE (99.7%-W)
TUNGSTEN SILICIDE, -325 MESH
Tungsten silicide, 99.5% (metals basis)
TUNGSTEN SILICIDE, 99.995% (METALS BASIS EXCLUDING MO), MO <
Tungsten silicide, 99.995% (metals basis excluding Mo), Mo <20ppm
[EINECS(EC#)]

234-909-0
[Molecular Formula]

Si2W
[MDL Number]

MFCD00049704
[MOL File]

12039-88-2.mol
[Molecular Weight]

240.01
Chemical PropertiesBack Directory
[Appearance]

Blue-gray, very hard solid. Insoluble in water; attacked by fused alkalies and mixture of nitric and hydrofluoric acids.
[Melting point ]

2165°C
[density ]

9,88 g/cm3
[solubility ]

insoluble in H2O
[form ]

Powder
[color ]

blue-gray tetragonal crystals, crystalline
[Specific Gravity]

9.88
[Resistivity]

33.4 (ρ/μΩ.cm)
[Water Solubility ]

Insoluble in water.
[Crystal Structure]

Tetragonal
[Hydrolytic Sensitivity]

2: reacts with aqueous acid
[Exposure limits]

ACGIH: TWA 3 mg/m3
NIOSH: TWA 5 mg/m3; STEL 10 mg/m3
[Uses]

Oxidation-resistant coatings, electrical resistance and refractory applications.
[CAS DataBase Reference]

12039-88-2
[EPA Substance Registry System]

Tungsten silicide (WSi2) (12039-88-2)
Safety DataBack Directory
[Safety Statements ]

22
[WGK Germany ]

3
[TSCA ]

Yes
Hazard InformationBack Directory
[Description]

Tungsten silicide (WSi2) is an inorganic compound, a silicide of tungsten. It is an electrically conductive ceramic material. Tungsten silicide can react violently with substances such as strong acids, fluorine, oxidizers, and interhalogens. It is employed in microelectronics as a contact material, with a resistivity of 60-80 μΩ cm; it forms at 1000℃. It is frequently used as a shunt over polysilicon lines to increase their conductivity and increase signal speed. 
[Chemical Properties]

Blue-gray, very hard solid. Insoluble in water; attacked by fused alkalies and mixture of nitric and hydrofluoric acids.
[Hazard]

Dust flammable.
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