Molybdenum disulfide
Chemical compound / From Wikipedia, the free encyclopedia
Molybdenum disulfide (or moly) is an inorganic compound composed of molybdenum and sulfur. Its chemical formula is MoS
2.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Molybdenum disulfide | |
Other names
Molybdenum(IV) sulfide | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.013.877 |
PubChem CID |
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RTECS number |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
MoS 2 | |
Molar mass | 160.07 g/mol[1] |
Appearance | black/lead-gray solid |
Density | 5.06 g/cm3[1] |
Melting point | 2,375 °C (4,307 °F; 2,648 K)[2] |
insoluble[1] | |
Solubility | decomposed by aqua regia, hot sulfuric acid, nitric acid insoluble in dilute acids |
Band gap | 1.23 eV (indirect, 3R or 2H bulk)[3] ~1.8 eV (direct, monolayer)[4] |
Structure | |
hP6, P6 3/mmc, No. 194 (2H) | |
a = 0.3161 nm (2H), 0.3163 nm (3R), c = 1.2295 nm (2H), 1.837 (3R) | |
Trigonal prismatic (MoIV) Pyramidal (S2−) | |
Thermochemistry | |
Std molar entropy (S⦵298) |
62.63 J/(mol K) |
Std enthalpy of formation (ΔfH⦵298) |
-235.10 kJ/mol |
Gibbs free energy (ΔfG⦵) |
-225.89 kJ/mol |
Hazards | |
Safety data sheet (SDS) | 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).
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"Molybdenum sulfide" redirects here. Not to be confused with Molybdenum trisulfide.
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.[6] 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 dry 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.[3]