Americium and trivalent Lanthanides incorporation in high-level waste glass-ceramics

JOURNAL OF NUCLEAR MATERIALS

卷:492

Article

Bardez-Giboire, Isabelle¹  Kidari, Abdessamad¹  Magnin, Magali²  Dussossoy, Jean-Luc²  Peuget, Sylvain²  Caraballo, Richard²  Tribet, Magaly²  Doreau, Franck²  Jegou, Christophe² 

[1] CEA, DEN, Lab Etud Dev Matrices Conditionnement, DE2D,SEVT, F-30207 Bagnols Sur Ceze, France

[2] CEA, DEN, Lab Etud Mat & Proc Actifs, DE2D,SEVT, F-30207 Bagnols Sur Ceze, France

关键词: Glass-ceramic;    Actinide;    Lanthanide;    High-level waste conditioning;    Apatite;   

DOI  :  10.1016/j.jnucmat.2017.05.045

来源: Elsevier

【 摘 要 】

The incorporation and partitioning of americium and trivalent lanthanides were investigated in aluminoborosilicate glass-ceramics with apatite-like silicate crystals of general formula Ca-2(Ln,Am)(8)(SiO4)(6)O-2. A microstructural and structural study of two glass-ceramics containing Am2O3 - La2O3 or Nd2O3 La2O3, respectively, was carried out by XRD, SEM/EDS and EMPA so as to assess a comparison of Lanthanides and Actinides partitioning into apatite crystals and residual glass. Moreover, Raman analyses of residual glasses were performed to compare the role of Am and Nd on the glassy structure. Results put forward that shape, composition, Ln/Am stoichiometry and cell parameters of apatite crystals of both (Am-La) and (Nd-La) glass-ceramics are very close. This paper thus shows similar results for (Am-La) and (Nd-La) glass-ceramics in terms of apatite/glass partitioning and in terms of structural role on glassy structure. It can be therefore put forward that Nd3+ and Am3+ behaviors are close, either in the glass or in the crystalline structure. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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