Crystal-Chemical Considerations in the Choice of Matrices for REE-Actinides

Light rare earth (REE) titanates, such as REE 2 TiO 5 , REE 2 Ti 2 O 7 , and REE 4 Ti 9 O 24 , are potential matrices for the REE-actinide fraction of high-level waste from the reprocessing of spent nuclear fuel. The data on the “solubility” of impurity elements (zirconium, uranium, and calcium) in...

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Published inDoklady earth sciences Vol. 504; no. 2; pp. 403 - 409
Main Authors Yudintsev, S. V., Nickolsky, M. S., Stefanovsky, O. I., Nikonov, B. S.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.06.2022
Springer
Springer Nature B.V
Subjects
Actinides
Analysis
Calcium
Calcium ions
Calcium zirconate
Earth and Environmental Science
Earth Sciences
Geoecology
Immobilization
Impurities
Isomorphism
Minerals
Nuclear energy
Nuclear fuel reprocessing
Nuclear industry
Reactor fuel reprocessing
Solubility
Spent nuclear fuels
Titanates
Uranium
Zirconium
REE-actinide fraction
REE titanates
immobilization
crystal chemistry
radioactive waste
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Summary:Light rare earth (REE) titanates, such as REE 2 TiO 5 , REE 2 Ti 2 O 7 , and REE 4 Ti 9 O 24 , are potential matrices for the REE-actinide fraction of high-level waste from the reprocessing of spent nuclear fuel. The data on the “solubility” of impurity elements (zirconium, uranium, and calcium) in these phases are summarized. The structures considered demonstrate limited isomorphism with respect to these elements, according to the reaction 2REE 3+ = Ca 2+ + U 4+ , which is common for natural minerals and their synthetic analogues. The reasons for the low “solubility” of these impurities in the REE titanates are considered. The role of the crystal-chemical factor in the selection of matrices for the immobilization of the REE-actinide fraction is analyzed.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X22060150