Niobium (IV) sulfide

Crystal structure
__ Nb 4+      __ S 2−
General
Surname	Niobium (IV) sulfide
other names	Niobium disulfide
Ratio formula	NbS 2
Brief description	black solid
External identifiers / databases
CAS number 12136-97-9 PubChem 11805338 Wikidata Q4445861
properties
Molar mass	157.04 g mol −1
Physical state	firmly
density	4.54 g cm −3
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Niobium (IV) sulfide is a chemical compound of niobium from the group of sulfides . In addition to this, at least four other niobium sulfides (Nb _{1 + x} S, Nb ₂₁ S ₈ , Nb _{1_x} S, Nb ₃ S ₄ , Nb _{1 + x} S ₂ with polytypes) are known. Many of them have areas of homogeneity or differ from one another as stacking variants of a basic grid type.

Extraction and presentation

Niobium (IV) sulfide can be obtained by reacting niobium with sulfur at 700 to 1000 ° C.

${\displaystyle \mathrm {Nb+2\ S\longrightarrow NbS_{2}} }$

properties

Niobium (IV) sulfide is a black solid. It has a trigonal crystal structure with the space group R 3 m (space group no. 160) . It is superconducting below 6.3 K. This form changes over 850 ° C into the high-temperature form 2H-NbS ₂ with the space group P 6 ₃ / mmc (No. 194) .

use

Niobium (IV) sulfide is used as a lubricant and sputtering material.

Individual evidence

1. ↑ ^{a b c} Roger Blachnik (Ed.): Pocket book for chemists and physicists . Volume III: Elements, Inorganic Compounds and Materials, Minerals . founded by Jean d'Ans, Ellen Lax. Reprint of the 1998 edition, 4th, revised and revised edition. Springer, Berlin 2012, ISBN 978-3-642-63755-1 , p. 634 ( limited preview in Google Book search).
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
3. ↑ ^{a b} Georg Brauer (Ed.), With the collaboration of Marianne Baudler u a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1470.
4. ↑ B. Morosin: Structure refinement on NbS2. In: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 30, p. 551, doi: 10.1107 / S0567740874003220 .
5. ^ PA Lee: Optical and Electrical Properties . Springer Science & Business Media, 2012, ISBN 978-94-010-1478-6 , pp. 115 ( limited preview in Google Book search).
6. ^ Christoph Janiak, Hans-Jürgen Meyer, Dietrich Gudat, Ralf Alsfasser: Riedel Modern Inorganic Chemistry . Walter de Gruyter, 2012, ISBN 978-3-11-024901-9 , p. 338 ( limited preview in Google Book search).
7. ^ Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2011, ISBN 978-1-4398-1462-8 , pp. 297 ( limited preview in Google Book search).