Journal Article

FZJ-2022-04452

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png LnUO4‐based glass–ceramic composites as waste forms for the immobilization of lanthanide‐bearing uranium wastes

Lu, K. T. ; Zhang, Y. (Corresponding author) ; Wei, T. ; Murphy, G.FZJ* ; Bhuiyan, A. ; Scales, N. ; Zheng, R.

2022
Soc. Westerville, Ohio

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Please use a persistent id in citations: http://hdl.handle.net/2128/32452  doi:10.1111/jace.18678

Abstract: We report a comprehensive study on lanthanide monouranate–based glass–ceramic (GC) composites as potential waste forms for the immobilization of the lanthanide actinide fraction waste arising from the reprocessing of spent nuclear fuel (SNF). Although the crystalline LnUO4 precursor prepared via a nitrate route can be well stabilized in a sodium aluminoborosilicate glass, the in situ crystallization of EuUO4 in glass from oxide precursors (Eu2O3 and U3O8) is rather robust with regards to various processing conditions such as waste loadings, ceramic-to-glass ratios, and cooling rates. Scanning electron microscopy and transmission electron microscopy investigations revealed the detailed microstructures, where ∼1–5-μm spheres for NdUO4 and EuUO4, and ∼1–5-μm rectangular crystals for DyUO4 and HoUO4 were observed in residual glasses. As designed, the pentavalent uranium has been confirmed by diffuse reflectance spectroscopy. Overall, LnUO4-based GC composite waste forms are chemically durable, offering flexible processing options with wide operating windows for SNF and process waste stream management.

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Contributing Institute(s):

1. Nukleare Entsorgung (IEK-6)

Research Program(s):

1. 1411 - Nuclear Waste Disposal (POF4-141) (POF4-141)

Appears in the scientific report 2022

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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