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Curium(IV) oxide

From Wikipedia, the free encyclopedia
Curium(IV) oxide
Names
Other names
Curium dioxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard100.031.453Edit this at Wikidata
EC Number
  • 234-612-6
  • InChI=1S/Cm.2O/q+4;2*-2
    Key: GAFRKXHDERQHAP-UHFFFAOYSA-N
  • [O-2].[O-2].[Cm+4]
Properties
CmO2
Molar mass279 g·mol−1
Appearanceblack crystals
insoluble
Related compounds
Othercations
Americium(IV) oxide
Berkelium(IV) oxide
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
Chemical compound

Curium(IV) oxide is aninorganic chemical compound ofcurium andoxygen with the chemical formulaCmO2. Since all isotopes of curium are man-made, the compound does not occur in nature.

Synthesis

[edit]
  • Curium(IV) oxide can be prepared directly from the elements. Metallic curium is annealed in air or in an oxygen atmosphere:[1]
Cm + O2 → CmO2
Cm(OH)4 → CmO2 + 2H2O
Cm(C2O4)2 → CmO2 + 2CO2 + 2CO
2Cm2O3 + O2 → 4CmO2

Physical properties

[edit]

Curium(IV) oxide forms black crystals.[3] Insoluble in water. The compound crystals are of thecubic crystal system, the fluorite structure in the space groupFm3m.

Chemical properties

[edit]

The compound reacts with mineral acids to form solutions of curium(III) salts.[4]

Uses

[edit]

The compound is used for the manufacturing of isotopic current sources, also as targets for the synthesis of transcurium elements.

References

[edit]
  1. ^Asprey, L. B.; Ellinger, F. H.; Fried, S.; Zachariasen, W. H. (March 1955)."EVIDENCE FOR QUADRIVALENT CURIUM: X-RAY DATA ON CURIUM OXIDES1".Journal of the American Chemical Society.77 (6):1707–1708.doi:10.1021/ja01611a108.ISSN 0002-7863. Retrieved29 June 2023.
  2. ^Noé, M.; Fuger, J. (1 May 1971)."Self-radiation effects on the lattice parameter of 244CmO2".Inorganic and Nuclear Chemistry Letters.7 (5):421–430.doi:10.1016/0020-1650(71)80177-0.ISSN 0020-1650. Retrieved29 June 2023.
  3. ^Konings, R. J. M. (1 October 2001)."Thermochemical and thermophysical properties of curium and its oxides".Journal of Nuclear Materials.298 (3):255–268.Bibcode:2001JNuM..298..255K.doi:10.1016/S0022-3115(01)00652-3.ISSN 0022-3115. Retrieved29 June 2023.
  4. ^Lumetta, Gregg J.; Thompson, Major C.; Penneman, Robert A.; Eller, P. Gary (2006)."Curium".The Chemistry of the Actinide and Transactinide Elements. Springer Netherlands:1397–1443.doi:10.1007/1-4020-3598-5_9.ISBN 978-1-4020-3555-5. Retrieved29 June 2023.
Curium(III)
Curium(IV)
Curium(VI)
Mixed oxidation states
+1 oxidation state
+2 oxidation state
+3 oxidation state
+4 oxidation state
+5 oxidation state
+6 oxidation state
+7 oxidation state
+8 oxidation state
Related
Oxides are sorted byoxidation state.Category:Oxides
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