Uranium disulfide - Misplaced Pages

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Uranium disulfide
Identifiers
CAS Number	12039-14-4
3D model (JSmol)	Interactive image
ECHA InfoCard	100.031.700
PubChem CID	131700999
CompTox Dashboard (EPA)	DTXSID2065204
InChI InChI=1S/2S.U/q2*-2;+4Key: OYHHCKFHGQELGK-UHFFFAOYSA-N
SMILES ..
Properties
Chemical formula	US₂
Molar mass	302.160 g/mol
Appearance	Black crystals
Structure
Crystal structure	Tetragonal (α-US₂)
Space group	P4/ncc (No. 130)
Lattice constant	a = 1029.3 pm, c = 637.4 pm
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Chemical compound

Uranium disulfide is an inorganic chemical compound of uranium in oxidation state +4 and sulfur in oxidation state -2. It is radioactive and appears in the form of black crystals.

Uranium disulfide has two allotropic forms: α-uranium disulfide, which is stable above the transition temperature (about 1350 °C) and metastable below it, and β-uranium disulfide which is stable below this temperature. The tetragonal crystal structure of α-US₂ is identical to α-USe₂.

Uranium disulfide can be synthesized by reduction of gaseous hydrogen sulfide with uranium metal powder at elevated temperatures.

References

^ Noel, H.; Le Marouille, J.Y. (1984). "Crystal structure and properties of the uranium chalcogenides α-US2 and α-USe2". Journal of Solid State Chemistry. 52 (3). Elsevier BV: 197–202. doi:10.1016/0022-4596(84)90001-x. ISSN 0022-4596.
Kohlmann, H.; Beck, H. P. (2000) . "Uranium's valency in U₃S₅". Journal of Solid State Chemistry. 150 (2). Academic: 339. Bibcode:2000JSSCh.150..336K. doi:10.1006/jssc.1999.8599.
Picon, Marius; Flahaut, Jean (1953). "Dimorphism of the uranium disulfide, US₂". Compt. Rend. 237: 808–810.
Assmann, Helmut; Stehle, Heinz (1981) . "Weitere Uranverbindungen als Kernbrennstoffe" [Other uranium compounds as nuclear fuels]. In Buschbeck, Karl-Christian; Keller, Cornelius (eds.). Handbuch der Anorganischen Chemie [Inorganic Chemistry Handbook]. Gmelin (in German). Vol. U: Uran (Suppl. A3) (8th ed.). Berlin: Springer. pp. 210–211. doi:10.1007/978-3-662-10275-6. ISBN 978-3-662-10276-3. LCCN 25-1383.