Chemistry:Uranium disulfide
From HandWiki
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3D model (JSmol)
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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). | |
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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
- ↑ 1.0 1.1 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.
- ↑ Kohlmann, H.; Beck, H. P. (2000). "Uranium's valency in U3S5". Journal of Solid State Chemistry (Academic) 150 (2): 339. doi:10.1006/jssc.1999.8599. Bibcode: 2000JSSCh.150..336K.
- ↑ 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". Handbuch der Anorganischen Chemie. Gmelin. 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.
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