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


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Article Info

DATE

2022-06

AUTHORS

S. V. Yudintsev, M. S. Nickolsky, O. I. Stefanovsky, B. S. Nikonov

ABSTRACT

Light rare earth (REE) titanates, such as REE2TiO5, REE2Ti2O7, and REE4Ti9O24, 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 2REE3+ = Ca2+ + U4+, 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. More... »

PAGES

403-409

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1028334x22060150

DOI

http://dx.doi.org/10.1134/s1028334x22060150

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1149417296


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