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Plutonium and americium monazite materials: Solid state synthesis and X-ray diffraction study

Abstract : High-temperature solid state syntheses of monazite powders containing plutonium (III), plutonium (IV) and americium (III) were performed. Resulting powders were characterized by X-ray diffraction. Pu3+PO4 was readily obtained as a single phase by heating a pU(4+)O(2)-NH4H2PO4 mixture under argon atmosphere. Traces of tetravalent plutonium phosphate pu(4+)P(2)O(7) were detected when synthesized under air atmosphere. The incorporation Of (pu(4+), Ca2+) in the monazite structure was investigated under air and argon atmosphere. We showed that pu(4+) is fully reduced in Pu3+ under argon atmosphere whereas, under air, the compound with the formula Pu0.43+Pu0.34+Ca0.32+PO4 was obtained. Pure Am3+PO4 was also synthesized under argon atmosphere. X-ray patterns revealed a complete amorphisation of the monazite structure at a relatively low cumulative alpha dose for (AmPO4)-Am-241.
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https://hal-emse.ccsd.cnrs.fr/emse-00446886
Contributor : Andrée-Aimée Toucas <>
Submitted on : Wednesday, January 13, 2010 - 3:53:32 PM
Last modification on : Wednesday, August 5, 2020 - 3:47:54 AM

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Damien Bregiroux, Renaud Belin, Philippe Valenza, Fabienne Audubert, Didier Bernache-Assollant. Plutonium and americium monazite materials: Solid state synthesis and X-ray diffraction study. Journal of Nuclear Materials, Elsevier, 2007, 366 (1-2), pp.52-57. ⟨10.1016/j.jnucmat.2006.12.042⟩. ⟨emse-00446886⟩

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