Niobium disulfide is the chemical compound with the formula NbS2. It is a black layered solid that can be exfoliated into ultrathin grayish sheets similar to other transition metal dichalcogenides. These layers exhibit superconductivity, where the transition temperature increases from ca. 2 to 6 K with the layer thickness increasing from 6 to 12 nm, and then saturates with thickness.[4]
 NbS2 exfoliated layer
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 NbS2 structure
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| Names | |
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| IUPAC name
niobium(IV) sulfde, niobium disulfde
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| NbS2 | |
| Molar mass | 157.038 g/mol[1] |
| Appearance | Black crystals[1] |
| Density | 4.4 g/cm3[1] |
| +120·10−6 cm3/mol[2] | |
| Structure[3] | |
| Trigonal, hR9, No. 160 | |
| R3m | |
a = 0.333 nm, b = 0.333 nm, c = 1.78 nm α = 90°, β = 90°, γ = 120°
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Formula units (Z)
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3 |
| Related compounds | |
Other anions
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Niobium diselenide, Niobium ditelluride |
Other cations
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Vanadium disulfide, Tantalum disulfide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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References
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- ^ a b c Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. p. 4.76. ISBN 0-8493-0486-5.
- ^ Lee, P.A. (6 December 2012). Optical and Electrical Properties. Springer Science & Business Media. p. 446. ISBN 978-94-010-1478-6.
- ^ Rajora, O. S.; Curzon, A. E. (1987). "The preparation and X‐ray diffraction study of the layer materials NbSxSe2−x for 0 ≦ x ≦ 2". Physica Status Solidi A. 99: 65–72. doi:10.1002/pssa.2210990108.
- ^ Yan, Rusen; Khalsa, Guru; Schaefer, Brian T.; Jarjour, Alexander; Rouvimov, Sergei; Nowack, Katja C.; Xing, Huili G.; Jena, Debdeep (2019). "Evolution of superconductivity in ultrathin NbS2". Applied Physics Express. 12 (2): 023008. arXiv:1803.06097. doi:10.7567/1882-0786/aaff89.