Uranium disulfide

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;+4 Key: OYHHCKFHGQELGK-UHFFFAOYSA-N;
	SMILES [S-2].[S-2].[U+4];
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 [77 °F], 100 kPa). Infobox references

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.^[2]

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.^[3] The tetragonal crystal structure of α-US₂ is identical to α-USe₂.^[1]

Uranium disulfide can be synthesized by reduction of gaseous hydrogen sulfide with uranium metal powder at elevated temperatures.^[4]

References

^ ^a ^b 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) [Oct 1, 1999]. "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) [Mid-1979]. "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.

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[Noel1984-1] 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.

[FromTbl-2] Kohlmann, H.; Beck, H. P. (2000) [Oct 1, 1999]. "Uranium's valency in U₃S₅". Journal of Solid State Chemistry. 150 (2). Academic: 339. Bibcode:2000JSSCh.150..336K. doi:10.1006/jssc.1999.8599.

[Allo-3] Picon, Marius; Flahaut, Jean (1953). "Dimorphism of the uranium disulfide, US₂". Compt. Rend. 237: 808–810.

[Gmelin-4] Assmann, Helmut; Stehle, Heinz (1981) [Mid-1979]. "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.

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