Uranium disulfide

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
Identifiers
3D model (JSmol)
ECHA InfoCard 100.031.700
  • InChI=1S/2S.U/q2*-2;+4
    Key: OYHHCKFHGQELGK-UHFFFAOYSA-N
  • [S-2].[S-2].[U+4]
Properties
US2
Molar mass 302.160 g/mol
Appearance Black crystals
Structure[1]
Tetragonal (α-US2)
P4/ncc (No. 130)
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 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. 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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