Neptunium trioxide
| Names | |
|---|---|
| Other names
Neptunium(VI) oxide
| |
| Identifiers | |
| Properties | |
| NpO3 | |
| Molar mass | 285 g·mol−1 |
| Appearance | dark brown crystals (hydrate) |
| insoluble | |
| Related compounds | |
Other cations
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|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Neptunium trioxide is an inorganic compound of neptunium and oxygen with the chemical formula NpO3.[1]
Synthesis
[edit]Neptunium trioxide can be obtained by oxidating neptunium(V) nitrate solution in a molten eutectic mixture of potassium and lithium nitrates with ozone at 150 °C. The reaction by-products are washed out with water.[2] Other methods are also known.[3][4]
Physical properties
[edit]The compound is highly volatile and exists only in the hydrated form.
Neptunium trioxide forms dark brown hydrate crystals of variable composition NpO3•xH2O, where x = 1–2.[5]
The NpO3•H2O hydrate crystals are of orthorhombic system.
It is insoluble in water.
References
[edit]- ^ Domanov, V. P. (1 August 2009). "Formation of volatile neptunium trioxide NpO3 and two other products of neptunium oxidation". Radiochemistry. 51 (4): 350–353. doi:10.1134/S1066362209040031. ISSN 1608-3288. Retrieved 17 October 2025.
- ^ Morss, L. R.; Edelstein, Norman M.; Fuger, Jean (31 December 2007). The Chemistry of the Actinide and Transactinide Elements (3rd ed., Volumes 1-5). Springer Science & Business Media. p. 770. ISBN 978-1-4020-3598-2. Retrieved 17 October 2025.
- ^ Lemire, Robert J. (26 August 2001). Chemical Thermodynamics of Neptunium and Plutonium. Elsevier. p. 118. ISBN 978-0-444-50379-4. Retrieved 17 October 2025.
- ^ Plutonium Abstracts. Hanford Laboratories. 1964. p. 8. Retrieved 17 October 2025.
- ^ Bagnall, K. W.; Laidler, J. B. (1 January 1964). "516. Neptunium and plutonium trioxide hydrates". Journal of the Chemical Society (Resumed) (0): 2693–2696. doi:10.1039/JR9640002693. ISSN 0368-1769. Retrieved 17 October 2025.