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]
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3D model (JSmol)
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ECHA InfoCard | 100.031.700 |
PubChem CID
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CompTox Dashboard (EPA)
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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
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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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]