Tungsten(IV) sulfide
File:Tunsgten(IV) sulfide.jpg
IUPAC name	Tungsten disulfide
Other names	Tungsten(IV) sulfide Tungstenite
Identifiers
CAS number	12138-09-9 Y
Properties
Molecular formula	WS2
Molar mass	247.98 g/mol
Appearance	blue-grey powder
Density	7.5 g/cm3, solid
Melting point	1250 °C decomp.
Structure
Crystal structure	Molybdenite
Coordination geometry	Trigonal prismatic (WIV) Pyramidal (S2−)
Hazards
EU Index	Not listed
Related compounds
Other anions	Tungsten(IV) oxide
Other cations	Molybdenum disulfide
Y (what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Tungsten(IV) sulfide is the chemical compound with the formula WS₂. It occurs naturally as the rare mineral called tungstenite. This material is a component of certain catalysts used for hydrodesulfurization and hydrodenitrification.

WS₂ adopts a layered structure related to MoS₂, with W atoms situated in trigonal prismatic coordination sphere.

[edit] Synthesis

WS₂ is produced by a number of methods including the following:^[1]

• Hydrothermal synthesis;
• Gas phase reaction of H₂S or H₂S/Ar mixture with tungsten metal;
• Thermal decomposition of ammonium tetrathiotungstate at ~1300 ⁰C in a flow of hydrogen gas;
• Direct decomposition of various tetraalkylammonium tetrathiotungstate precursors under nitrogen atmosphere;
• Microwave treatment of a solution of tungstic acid, elemental sulfur and monoethanolamine.

[edit] Uses

Nanostructured WS₂ finds application as hydrogen and lithium storage material, as material for solid-state secondary lithium battery cathodes; as a component of batteries and other electrochemical devices; as catalyst in hydrodesulfurization of crude oil and as a dry lubricant.^[1]

Tungsten disulfide is being investigated by ApNano for production of tungsten disulfide nanotube nanocomposites for use in e.g. ballistic vests. It can be used for production of ceramic plates that offer over twice the protection of equivalent mass of boron carbide. In combination with elastic materials, flexible shock absorbing materials can be produced.^[2]

[edit] References

This inorganic compound-related article is a stub. You can help Wikipedia by expanding it. v • d • e