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Plutonium(III) phosphate

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Chemical compound

Not to be confused withPlutonium phosphide.

Plutonium(III) phosphate
Identifiers

Plutonium phosphate has a dark violet^[1] to green color^[2]
CAS Number	35310-25-9
3D model (JSmol)	Interactive image
InChI InChI=1S/H3O4P.Pu/c1-5(2,3)4;/h(H3,1,2,3,4);/q;+3/p-3 Key: LTDJAEKVSMMOGC-UHFFFAOYSA-K
SMILES [O-]P(=O)([O-])[O-].[Pu+3]
Properties
Chemical formula	PuPO₄
Molar mass	339 g·mol⁻¹
Appearance	Dark violet to green depending on hydration and form
Solubility in water	Insoluble
Structure
Crystal structure	Monazite
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chemical compound

Plutonium(III) phosphate is aninorganic compound ofplutonium, with the molecular formulaPuPO₄.^[1] It is the trivalent plutonium salt ofphosphoric acid.

Preparation

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Heating a mixture ofplutonium dioxide anddiammonium phosphate to 1000°C for 12 hours producespolycrystalline 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 andphosphorus pentoxide.^[3]

Reactingplutonium(IV) nitrate withdisodium phosphate producesPuP₂O₇ 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

Reactingplutonium(III) fluoride withboron phosphate also produces plutonium phosphate.^[4]

PuF₃ + BPO₄ → PuPO₄ + BF₃

Properties

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Plutonium phosphate crystalizes in themonazite crystal structure.^[1]

It does not dissolve in water.^[5]

References

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^^a ^b ^c ^dPopa, 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.
^^a ^bThiriet, 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. Retrieved2025-08-12.
^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.
^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.
^Lemire, Robert J. (2001-08-26).Chemical Thermodynamics of Neptunium and Plutonium. Amsterdam: Elsevier. p. 845.ISBN 0-444-50379-X.