Curium(III) fluoride
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Crystal structure | |
Names | |
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IUPAC name Curium(III) fluoride | |
Other names Curium trifluoride | |
Identifiers | |
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Properties | |
Chemical formula | CmF3 |
Appearance | Colorless solid[1] |
Melting point | 1406 ± 20 °C;[1] |
Solubility in water | ~10 mg/L |
Structure | |
Crystal structure | Rhombohedral, hR24 |
Space group | P3c1, No. 165[2] |
Lattice constant | a = 0.7012 nm, c = 0.7198 nm |
Lattice volume (V) | 0.30650 |
Formula units (Z) | 6 |
Thermochemistry | |
Std molar entropy (S⦵298) | 121 J/mol·K[1] |
Std enthalpy of formation (ΔfH⦵298) | −1660 kJ/mol[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references |
Curium(III) fluoride or curium trifluoride is the chemical compound composed of curium and fluorine with the formula CmF3.[3] It is a white, nearly insoluble salt that has the same crystal structure as LaF3. It precipitates as a hydrate when fluoride ions are added to a weakly acidic Cm(III) solution; alternatively it can be synthesized by reacting hydrofluoric acid with Cm(OH)3. The anhydrous form is then obtained by desiccation or by treatment with hydrogen fluoride gas.[1]
Preparation
Curium fluoride can be prepared by in the reaction of curium with fluorine ions in an aqueous solution under weakly acidic conditions:
Another possible preparation is the reaction of curium hydroxide with hydrofluoric acid, which also produces a hydrate of Curium fluoride.[4]
References
- ^ a b c d e Haire, Richard G. (2006). "Curium (9.7.3 Halides)". In Morss; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. p. 1417. doi:10.1007/1-4020-3598-5_9. ISBN 1-4020-3555-1.
- ^ Nave, S. E.; Haire, R. G.; Huray, Paul G. (1983). "Magnetic properties of actinide elements having the 5f6 and 5f7 electronic configurations". Physical Review B. 28 (5): 2317. doi:10.1103/PhysRevB.28.2317.
- ^ Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3046. ISBN 978-0-412-30120-9. Retrieved 27 June 2023.
- ^ Lumetta, Gregg J.; Thompson, Major C.; Penneman, Robert A.; Eller, P. Gary (2006). Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). Curium. Dordrecht: Springer Netherlands. pp. 1397–1443. doi:10.1007/1-4020-3598-5_9. ISBN 978-1-4020-3598-2.
- v
- t
- e
- Cm(OH)3
- Cm2O3
- CmF3
- CmCl3
- CmBr3
- CmI3
- Cm(NO3)3
- CmN
- Cm2(C2O4)3
- CmO2
- CmF4
- CmF6