Phase evolution and chemical durability of Nd-doped zircon ceramics designed to immobilize trivalent actinides
Source abstract
Abstract
Abstract Zr 1− x Nd x SiO 4− x /2 (0≤ x ≤0.1) ceramics were prepared by solid-state reaction method. The effects of Nd content on the phase structure of the ceramics were investigated. The chemical durability of Nd-doped zircon ceramic waste forms was also examined. The results show that the ceramics with x x ≥0.04 e x hibit coexistence of two crystal phases (zircon and Nd 2 Si 2 O 7 ). The bulk density of the Nd-doped zircon ceramics increases with the increase in neodymium content. Moreover, the normalized element release rates of Nd element in Nd-doped zircon ceramics firstly decrease with leaching time and almost no change after 14 days (~10 −4 g m −2 d −1 ), demonstrating its good chemical durability. These results indicate that the obtained zircon ceramics waste forms are promising candidate for immobilization of trivalent actinides.
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Research context
OpenAlex topics: Nuclear materials and radiation effects · Nuclear Materials and Properties · Advanced Condensed Matter Physics
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