Niobium diselenide
2H NbSe2 structure | |
Electron micrograph showing a local coexistence of different NbSe2 structures in one sample | |
| Names | |
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| Other names
Niobium(IV) selenide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.031.634 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| NbSe2 | |
| Molar mass | 250.83 g/mol |
| Appearance | Gray solid |
| Density | 6.3 g/cm3 |
| Melting point | >1300 °C |
| Structure | |
| hP6, space group P6 3/mmc, No 194 | |
a = 0.344 nm, c = 1.254 nm | |
| Trigonal prismatic (NbIV) Pyramidal (Se2−) | |
| Related compounds | |
Other anions |
Niobium dioxide |
Other cations |
Molybdenum diselenide Tungsten diselenide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Niobium diselenide or niobium(IV) selenide is a layered transition metal dichalcogenide with formula NbSe2. Niobium diselenide is a lubricant, and a superconductor at temperatures below 7.2 K that exhibit a charge density wave (CDW). NbSe2 crystallizes in several related forms, and can be mechanically exfoliated into monatomic layers, similar to other transition metal dichalcogenide monolayers. Monolayer NbSe2 exhibits very different properties from the bulk material, such as of Ising superconductivity, quantum metallic state, and strong enhancement of the CDW.