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Neptunium(IV) phosphide is a binary inorganic compound of neptunium metal and phosphorus with the chemical formula Np₃P₄.

Preparation

Neptunium(IV) phosphide can be formed from the fusion of stoichiometric amounts of neptunium and red phosphorus in an evacuated and sealed quartz tube at 750 °C:

3Np + 4P → Np₃P₄

Physical properties

Neptunium(IV) phosphide forms black crystals of cubic crystal system, spatial group I 43d. Isostructural with Th₃P₄.

It does not dissolve in water.

Chemical properties

The compound reacts with concentrated HCl to give a green solution:

Np₃P₄ + 12HCl → 3NpCl₄ + 4PH₃

References

1. Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3671. ISBN 978-0-412-30120-9. Retrieved 5 March 2024.
2. Isotopic Power Sources ...: A Compendium : Property and Processes Review. Martin Nuclear Division. 1961. p. 2-170. Retrieved 19 March 2024.
3. 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. 743. ISBN 978-1-4020-3598-2. Retrieved 19 March 2024.
4. Koch, Günter (5 October 2013). Transurane: Teil C: Die Verbindungen (in German). Springer-Verlag. p. 249. ISBN 978-3-662-11547-3. Retrieved 19 March 2024.
5. Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3671. ISBN 978-0-412-30120-9. Retrieved 19 March 2024.

• Neptunium compounds
• Phosphorus compounds
• Phosphides
• Cubic crystals