Curium(IV) oxide explained

Curium(IV) oxide is an inorganic chemical compound of curium and oxygen with the chemical formula . Since all isotopes of curium are man-made, the compound does not occur in nature.

Synthesis

• Curium(IV) oxide can be prepared directly from the elements. Metallic curium is annealed in air or in an oxygen atmosphere:^[1]

• Curium(III) hydroxide and curium(III) oxalate are also usually used for this purpose:

• Another way is the reaction of curium(III) oxide in an oxygen atmosphere at 650 °C:^[2]

Physical properties

Curium(IV) oxide forms black crystals.^[3] Insoluble in water. The compound crystals are of the cubic crystal system, the fluorite structure in the space group Fm3m.

Chemical properties

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

Uses

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

Notes and References

1. Asprey . L. B. . Ellinger . F. H. . Fried . S. . Zachariasen . W. H. . EVIDENCE FOR QUADRIVALENT CURIUM: X-RAY DATA ON CURIUM OXIDES¹ . . March 1955 . 77 . 6 . 1707–1708 . 10.1021/ja01611a108 . 29 June 2023 . en . 0002-7863.
2. Noé . M. . Fuger . J. . Self-radiation effects on the lattice parameter of 244CmO2 . . 1 May 1971 . 7 . 5 . 421–430 . 10.1016/0020-1650(71)80177-0 . 29 June 2023 . en . 0020-1650.
3. Konings . R. J. M. . Thermochemical and thermophysical properties of curium and its oxides . . 1 October 2001 . 298 . 3 . 255–268 . 10.1016/S0022-3115(01)00652-3 . 2001JNuM..298..255K . 29 June 2023 . en . 0022-3115.
4. Lumetta . Gregg J. . Thompson . Major C. . Penneman . Robert A. . Eller . P. Gary . Curium . The Chemistry of the Actinide and Transactinide Elements . 2006 . 1397–1443 . 10.1007/1-4020-3598-5_9 . 29 June 2023 . Springer Netherlands . 978-1-4020-3555-5 . en.