Incorporation of REE into Secondary Phase Studtite. Issue 1665 (2014)

• Record Type: Journal Article
• Authors: Palomo, C.; Rodríguez, N.; Iglesias, E.; Nieto, J.; Cobos, J.; Quiñones, J.
• Is Part Of: MRS proceedings. Issue 1665:(2014)
• Page Start: 71
• Page End: 77
• Publication Date: 2014
• Subjects: second phases, -- lanthanides, -- U; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/opl.2014.630
• Languages: English
• ISSNs: 0272-9172

Abstract

ABSTRACT: The formation of uranyl peroxide phases was identified as a corrosion product of spent fuel by Hanson et al [1]. The subsequent analysis of this phase showed that metastudtite retained 241 Am, 237 Np and 239 Pu [2]. In this study, the retention of radionuclide Pu 4+ and An 3+, released from the spent fuel matrix into studtite structure, has been evaluated by the precipitation of studtite from uranyl dissolution with variable concentrations of REE (Th, Nd, Sm and Eu). Three different precipitation conditions parameters were studied: media of synthesis, time of synthesis and REE concentration. Synthesized phases were characterized by XRD and the cell parameter was calculated. The REE incorporation was determined by ICP-MS analysis. The results showed that studtite could incorporate 63% of Th in solution during its precipitation. Changes in the "a" cell parameter were identified. The results suggest that studtite coprecipitated with REE could play a role as a limiting for the REE mobility.