Improvement of the preparation of sintered pellets of thorium phosphate-diphosphate and associated solid solutions from crystallized precursors

被引：22
作者：
Clavier, N.
Dacheux, N.
Wallez, G.
Quarton, M.
机构：
[1] Univ Paris 11, Grp Radiochim, Inst Nucl Phys, F-91406 Orsay, France
[2] Univ Paris 06, Lab Cristallochim Solide, F-75252 Paris, France
来源：
JOURNAL OF NUCLEAR MATERIALS | 2006年 / 352卷 / 1-3期
关键词：
D O I：
10.1016/j.jnucmat.2006.02.056
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Several compositions of thorium-uranium (IV) phosphate-hydrogenphosphate hydrate (Ux/2Th2-x/2(PO4)(2)-(HPO4) (.) H2O, TUPHPH) were prepared starting from actinides chloride solutions and concentrated phosphoric acid. The experimental synthesis parameters were optimized in order to get the quantitative precipitation of the cations and a good crystallization state. The extensive characterization of the solids demonstrated the existence of a complete solid solution between Th and U end-members and evidenced the good homogeneity of the powders. Their behaviors during heating treatment were then checked and confirm the formation of anhydrous thorium-uranium (IV) phosphate-hydrogenphosphate (TUPHP) and alpha-U-x,Th4-x(PO4)(4)(P2O7) (alpha-TUPD) acting as intermediates. Finally, the low-temperature crystallized precursors were used in original sintering processes in order to improve the efficiency of the former cold-pressing sintering procedure. (c) 2006 Elsevier B.V. All rights reserved.
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页码：209 / 216
页数：8
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