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.

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.^[2] The tetragonal crystal structure of α-US₂ is identical to α-USe₂.^[1]

References

1 2 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. Elsevier BV. 52 (3): 197–202. doi:10.1016/0022-4596(84)90001-x. ISSN 0022-4596.
↑ Picon, Marius; Flahaut, Jean (1953). "Dimorphism of the uranium disulfide, US₂". Compt. Rend. 237: 808–810.{{cite journal}}: CS1 maint: multiple names: authors list (link)

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[Noel1984-1] 1 2 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. Elsevier BV. 52 (3): 197–202. doi:10.1016/0022-4596(84)90001-x. ISSN 0022-4596.

[2] Picon, Marius; Flahaut, Jean (1953). "Dimorphism of the uranium disulfide, US₂". Compt. Rend. 237: 808–810.{{cite journal}}: CS1 maint: multiple names: authors list (link)

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