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Molybdenum disulphide

Molybdenum disulfide
Molybdenum disulfide
Molybdenite-3D-balls.png
Names
IUPAC name
Molybdenum disulfide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.013.877
PubChem CID
RTECS number QA4697000
Properties
MoS
2
Molar mass 160.07 g/mol
Appearance black/lead-gray solid
Density 5.06 g/cm3
Melting point 1,185 °C (2,165 °F; 1,458 K) or higher
insoluble
Solubility decomposed by aqua regia, hot sulfuric acid, nitric acid
insoluble in dilute acids
Band gap 1.23 eV (indirect, 3R or 2H bulk)
~1.8 eV (direct, monolayer)
Structure
hP6, P6
3
/mmc
, No. 194 (2H)

hR9, R3m, No 160 (3R)

a = 0.3161 nm (2H), 0.3163 nm (3R), c = 1.2295 nm (2H), 1.837 (3R)
Trigonal prismatic (MoIV)
Pyramidal (S2−)
Hazards
Safety data sheet External MSDS
Related compounds
Other anions
Molybdenum(IV) oxide
Molybdenum diselenide
Molybdenum ditelluride
Other cations
Tungsten disulfide
Related lubricants
Graphite
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YesYN ?)
Infobox references

hR9, R3m, No 160 (3R)

Molybdenum disulfide is an inorganic compound composed of molybdenum and sulfur. Its chemical formula is MoS
2
.

The compound is classified as a transition metal dichalcogenide. It is a silvery black solid that occurs as the mineral molybdenite, the principal ore for molybdenum.MoS
2
is relatively unreactive. It is unaffected by dilute acids and oxygen. In appearance and feel, molybdenum disulfide is similar to graphite. It is widely used as a solid lubricant because of its low friction and robustness. Bulk MoS
2
is a diamagnetic, indirect bandgap semiconductor similar to silicon, with a bandgap of 1.23 eV.

MoS2 is naturally found as either molybdenite, a crystalline mineral, or jordisite, a rare low temperature form of molybdenite. Molybdenite ore is processed by flotation to give relatively pure MoS
2
. The main contaminant is carbon. MoS
2
also arises by thermal treatment of virtually all molybdenum compounds with hydrogen sulfide or elemental sulfur and can be produced by metathesis reactions from molybdenum pentachloride.


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