| Thème(s) : |
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Physique/Physique/Chimie-Physique
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| Titre : |
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Hydrothermal Method of Preparation of Actinide(IV) Phosphate Hydrogenphosphate Hydrates and Study of Their Conversion into Actinide(IV) Phosphate Diphosphate Solid Solutions |
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| Auteur : |
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N. Dacheux1, S. Grandjean, J. Rousselle, N. Clavier |
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| Laboratoire : |
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| Résumé : |
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Several compositions of Th2-x/2AnIVx/2(PO4)2(HPO4)·H2O (An = U, Np, Pu) were prepared through hydrothermal precipitation from a mixture of nitric solutions containing cations and concentrated phosphoric acid. All the samples were fully characterized by X-ray diffraction, UV-vis, and infrared spectroscopies to check for the existence of thorium-actinide(IV) phosphate hydrogenphosphate hydrates solid solutions. Such compounds were obtained as single phases, up to x = 4 for uranium, x = 2 for neptunium, and x < 4 for plutonium, the cations being fully maintained in the tetravalent oxidation state. In a second step, the samples obtained after heating crystallized precursors at high temperature (1100 C) were characterized. Single-phase thorium-actinide(IV) phosphate-diphosphate solid solutions were obtained up to x = 0.8 for Np(IV) and x = 1.6 for Pu(IV). For higher substitution rates, polyphase systems composed by -TAnPD, An2O(PO4)2, and/or -AnP2O7 were formed. Finally, this hydrothermal route of preparation was applied successfully to the synthesis of an original phosphate-based compound incorporating simultaneously tetravalent uranium, neptunium and plutonium. |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
ou d'écriture : |
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2007 |
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| Nom du périodique : |
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| Inorganic Chemistry (Inorg. Chem.) |
| Publisher |
American Chemical Society |
| ISSN |
0020-1669 (eISSN : 1520-510X) |
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| Volume : |
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46 |
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| Page/Article : |
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10390-10399 |
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