Electron micrograph showing a local coexistence of different NbSe2 structures in one sample
Names
Other names
Niobium(IV) selenide
Identifiers
CAS Number
12034-77-4
3D model (JSmol)
Interactive image
ChemSpider
74754
ECHA InfoCard
100.031.634
EC Number
234-811-8
PubChem CID
82841
CompTox Dashboard (EPA)
DTXSID501014243
InChI
InChI=1S/Nb.2Se
Key: CXRFFSKFQFGBOT-UHFFFAOYSA-N
SMILES
[Se]=[Nb]=[Se]
Properties
Chemical formula
NbSe2
Molar mass
250.83 g/mol[1]
Appearance
Gray solid[1]
Density
6.3 g/cm3[1]
Melting point
>1300 °C[1]
Structure
Crystal structure
hP6, space group P6 3/mmc, No 194[2]
Lattice constant
a = 0.344 nm, c = 1.254 nm
Coordination geometry
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
Chemical compound
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.[3]
^ abcdHaynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.78. ISBN 1-4398-5511-0.
^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 (1): 65. Bibcode:1987PSSAR..99...65R. doi:10.1002/pssa.2210990108.
^Cite error: The named reference nat was invoked but never defined (see the help page).
and 16 Related for: Niobium diselenide information
Niobiumdiselenide or niobium(IV) selenide is a layered transition metal dichalcogenide with formula NbSe2. Niobiumdiselenide is a lubricant, and a superconductor...
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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...
superalloys used for special applications contain hafnium in combination with niobium, titanium, or tungsten. Hafnium's large neutron capture cross section makes...
friction of lamellar 2D-materials (e.g. graphene, molybdenum disulfide, niobiumdiselenide, and hexagonal boron nitride) increases as the number of layers decreases...
solid lubricant and catalyst for hydrodesulfurization. The corresponding diselenides and even ditellurides are known, e.g., TiSe2, MoSe2, and WSe2. Transition...
with other chalcogens are also known, such as the disulfide (GeS 2) and diselenide (GeSe 2), and the monosulfide (GeS), monoselenide (GeSe), and monotelluride...
thioethers), diselenides (R2Se2, analogues of disulfides), and selenols (RSeH, analogues of thiols). Representatives of selenides, diselenides, and selenols...
monoxide, carbon suboxide, and carbon dioxide. Carbon forms disulfides and diselenides. Silicon forms several hydrides; two of them are SiH4 and Si2H6. Silicon...
triaquo complex [TcO3(H2O)3]+. Technetium forms a dioxide, disulfide, diselenide, and ditelluride. An ill-defined Tc2S7 forms upon treating pertechnate...
which is oxidized to IrO 2 by HNO 3. The corresponding disulfides, diselenides, sesquisulfides, and sesquiselenides are known, as well as IrS 3. Binary...
dioxide is capable of forming plumbate anions. Lead disulfide and lead diselenide are only stable at high pressures. Lead tetrafluoride, a yellow crystalline...
(14): 2717–24. doi:10.1021/ic00313a007. Se(−1) has been observed in diselenides(2−) (Se22−). A Se(0) atom has been identified using DFT in [ReOSe(2-pySe)3];...
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