Californium (IV) oxide
| Crystal structure | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||
| __ Cf 4+ __ O 2− | |||||||||||||
| Crystal system | |||||||||||||
| Space group |
Fm 3 m (No. 225) |
||||||||||||
| Lattice parameters |
a = 531 pm |
||||||||||||
| Coordination numbers |
Cf [8], O [4] |
||||||||||||
| General | |||||||||||||
| Surname | Californium (IV) oxide | ||||||||||||
| other names |
Californium dioxide |
||||||||||||
| Ratio formula | CfO 2 | ||||||||||||
| Brief description |
black-brown solid |
||||||||||||
| External identifiers / databases | |||||||||||||
|
|||||||||||||
| properties | |||||||||||||
| Molar mass | 283.08 g mol −1 | ||||||||||||
| Physical state |
firmly |
||||||||||||
| Hazard and safety information | |||||||||||||
 Radioactive |
|||||||||||||
|
|||||||||||||
| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||
Californium (IV) oxide is an oxide of the element californium . It has the molecular formula CfO 2 . Since all isotopes of Californium are only artificially produced, it does not have any natural occurrences. Among other things, it is implicitly created in small quantities in nuclear reactors when uranium dioxide (UO 2 ) or plutonium dioxide (PuO 2 ) are irradiated with neutrons.
presentation
Californium (IV) oxide is produced by oxidation with molecular oxygen at high pressure and by atomic oxygen.
properties
Californium (IV) oxide is a black-brown solid and crystallizes in the cubic crystal system in the fluorite structure in the space group Fm 3 m (No. 225) with the coordination numbers Cf [8], O [4]. The lattice parameter is 531.0 ± 0.2 pm .
safety instructions
Classifications according to the CLP regulation are not available because they only include chemical hazard and play a completely subordinate role compared to the hazards based on radioactivity . The latter also only applies if the amount of substance involved is relevant.
Individual evidence
- ↑ Californium (IV) oxide at www.webelements.com.
- ↑ The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.
- ↑ a b R. D. Baybarz, RG Haire, JA Fahey: On the Californium Oxide System , in: J. Inorg. Nucl. Chem. , 1972 , 34 (2), pp. 557-565 ( doi: 10.1016 / 0022-1902 (72) 80435-4 ).
literature
- Richard G. Haire: Californium , in: Lester R. Morss, Norman M. Edelstein, Jean Fuger (Eds.): The Chemistry of the Actinide and Transactinide Elements , Springer, Dordrecht 2006; ISBN 1-4020-3555-1 , pp. 1499-1576 ( doi: 10.1007 / 1-4020-3598-5_11 ).