Molybdenum disulfide
| Names | |
|---|---|
| IUPAC name
Molybdenum disulfide | |
| Other names
Molybdenum(IV) sulfide | |
| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChemSpider | |
| 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 | |
| MoS2 | |
| Molar mass | 160.07 g·mol−1 |
| Appearance | black/lead-gray solid |
| Density | 5.06 g/cm3 |
| Melting point | 2,375 °C (4,307 °F; 2,648 K) |
| 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) | |
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).
Infobox references | |
Molybdenum disulfide (or moly) is an inorganic compound composed of molybdenum and sulfur. Its chemical formula is MoS2.
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. MoS2 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 MoS2 is a diamagnetic, indirect bandgap semiconductor similar to silicon, with a bandgap of 1.23 eV.