Plutonium(III) phosphate

Last updated
Plutonium(III) phosphate
Pu3+.svg Phosphat-Ion.svg
PuPO4 pellet.jpg
Plutonium phosphate has a dark violet [1] to green color [2]
Identifiers
3D model (JSmol)
  • InChI=1S/H3O4P.Pu/c1-5(2,3)4;/h(H3,1,2,3,4);/q;+3/p-3
    Key: LTDJAEKVSMMOGC-UHFFFAOYSA-K
  • [O-]P(=O)([O-])[O-].[Pu+3]
Properties
PuPO4
Molar mass 339 g·mol−1
AppearanceDark violet to green depending on hydration and form
Insoluble
Structure
Monazite
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Plutonium(III) phosphate is an inorganic compound of plutonium, with the molecular formula PuPO4. [1] It is the trivalent plutonium salt of phosphoric acid.

Contents

Preparation

Heating a mixture of plutonium dioxide and diammonium phosphate to 1000°C for 12 hours produces polycrystalline plutonium phosphate. [1]

2 PuO2 + 2 (NH4)2HPO4 → 2 PuPO4 + 4 NH3 + 3 H2O + 1/2 O2

Heating the product to 1100°C produces plutonium dioxide and phosphorus pentoxide. [3]

Reacting plutonium(IV) nitrate with disodium phosphate produces PuP2O7 which is decomposed to plutonium phosphate when heated to 600°C for 6 hours in an argon/hydrogen atmosphere. [2]

Pu(NO3)4 + 2 Na2HPO4 → PuP2O7 + 4 NaNO3 + H2O
4 PuP2O7 → 4 PuPO4 + 2 P2O5 + O2
2 PuP2O7 + H2 → 2 PuPO4 + P2O5 + H2O

Reacting plutonium(III) fluoride with boron phosphate also produces plutonium phosphate. [4]

PuF3 + BPO4 → PuPO4 + BF3

Properties

Plutonium phosphate crystalizes in the monazite crystal structure. [1]

It does not dissolve in water. [5]

References

  1. 1 2 3 4 Popa, Karin; Raison, Philippe E.; Martel, Laura; Martin, Philippe M.; Prieur, Damien; Solari, Pier L.; Bouëxière, Daniel; Konings, Rudy J.M.; Somers, Joseph (2015). "Structural investigations of PuIII phosphate by X-ray diffraction, MAS-NMR and XANES spectroscopy". Journal of Solid State Chemistry. 230. Elsevier BV: 169–174. doi: 10.1016/j.jssc.2015.07.002 . ISSN   0022-4596.
  2. 1 2 Thiriet, C.; Konings, R.J.M.; Wastin, F. (2005). "Low temperature heat capacity of PuPO4". Journal of Nuclear Materials. 344 (1–3): 56–60. doi:10.1016/j.jnucmat.2005.04.016 . Retrieved 2025-08-12.
  3. ↑ Jardin, Regis; Pavel, Claudiu C.; Raison, Philippe E.; Bouëxière, Daniel; Santa-Cruz, Hernan; Konings, Rudy J.M.; Popa, Karin (2008). "The high-temperature behaviour of PuPO4 monazite and some other related compounds". Journal of Nuclear Materials. 378 (2). Elsevier BV: 167–171. doi:10.1016/j.jnucmat.2008.05.011. ISSN   0022-3115.
  4. ↑ Bamberger, C.E.; Haire, R.G.; Hellwege, H.E.; Begun, G.M. (1984). "Synthesis and characterization of crystalline phosphates of plutonium(III) and plutonium(IV)". Journal of the Less Common Metals. 97. Elsevier BV: 349–356. doi:10.1016/0022-5088(84)90040-7. ISSN   0022-5088.
  5. ↑ Lemire, Robert J. (2001-08-26). Chemical Thermodynamics of Neptunium and Plutonium. Amsterdam: Elsevier. p. 845. ISBN   0-444-50379-X.
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