Chemistry:Neptunium trioxide
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| Names | |
|---|---|
| Other names
Neptunium(VI) oxide
| |
| Identifiers | |
| Properties | |
| NpO 3 | |
| 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). | |
| Infobox references | |
Tracking categories (test):
Neptunium trioxide is an inorganic compound of neptunium and oxygen with the chemical formula NpO
3.[1]
Synthesis
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
The compound is highly volatile and exists only in the hydrated form.
Neptunium trioxide forms dark brown hydrate crystals of variable composition NpO
3•xH
2O, where x = 1–2.[5]
The NpO
3•H
2O hydrate crystals are of orthorhombic system.
It is insoluble in water.
References
- ↑ Domanov, V. P. (1 August 2009). "Formation of volatile neptunium trioxide NpO3 and two other products of neptunium oxidation" (in en). Radiochemistry 51 (4): 350–353. doi:10.1134/S1066362209040031. ISSN 1608-3288. https://link.springer.com/article/10.1134/S1066362209040031. Retrieved 17 October 2025.
- ↑ Morss, L. R.; Edelstein, Norman M.; Fuger, Jean (31 December 2007) (in en). 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. https://www.google.ru/books/edition/The_Chemistry_of_the_Actinide_and_Transa/KyHyM0ObXrAC?hl=en&gbpv=1&dq=Neptunium+trioxide&pg=PA770&printsec=frontcover. Retrieved 17 October 2025.
- ↑ Lemire, Robert J. (26 August 2001) (in en). Chemical Thermodynamics of Neptunium and Plutonium. Elsevier. p. 118. ISBN 978-0-444-50379-4. https://www.google.ru/books/edition/Chemical_Thermodynamics_of_Neptunium_and/ApDIq9BatBMC?hl=en&gbpv=1&dq=Neptunium+trioxide+NpO3&pg=PA118&printsec=frontcover. Retrieved 17 October 2025.
- ↑ (in en) Plutonium Abstracts. Hanford Laboratories. 1964. p. 8. https://www.google.ru/books/edition/Plutonium_Abstracts/kJUEpBtvwYUC?hl=en&gbpv=1&dq=%22Neptunium+trioxide%22&pg=PA8&printsec=frontcover. Retrieved 17 October 2025.
- ↑ Bagnall, K. W.; Laidler, J. B. (1 January 1964). "516. Neptunium and plutonium trioxide hydrates" (in en). Journal of the Chemical Society (Resumed) (0): 2693–2696. doi:10.1039/JR9640002693. ISSN 0368-1769. https://pubs.rsc.org/en/content/articlelanding/1964/jr/jr9640002693. Retrieved 17 October 2025.
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