NDLI: Potential matrices for immobilization of the rare earth-actinide fraction of high-level waste in the REE$_{2}$Zr$_{2}$O$_{7}$-REE$_{2}$Ti$_{2}$O$

Content Provider	Springer Nature Link
Author	Yudintsev, S. V. Stefavsky, S. V. Nikov, B. S. Nikol’skii, M. S. Livshits, T. S.
Copyright Year	2015
Abstract	Phase compositions, structural features, and element distributions were studied for samples of the compositions REE$_{2}$(Zr$_{2−x }$Ti$_{ x }$)O$_{7}$, which are potential matrices for immobilization of the rare earth-actinide fraction of high-level waste from spent nuclear fuel reprocessing. Samples with x up to 0.8 consist of pyrochlore, and at higher titanium content, of pyrochlore and monoclinic REE titanate with perovskite-type structure. The monoclinic phase becomes prevalent at x > 1.2. With respect to the content of the incorporated waste, it surpasses pyrochlore matrices by 10 wt %. The radiation resistance of this phase is close to that of titanate pyrochlore, but its amorphization dose is lower than for zirconate and titanate-zirconate pyrochlore. To check the suitability of monoclinic titanate for immobilization of the REE-actinide waste fraction, it is necessary to study its behavior in solutions and the effect of amorphization on the actinide leaching. The matrix can be prepared by the cold pressing-sintering method suggested in the United States for the synthesis of pyrochlore matrices with plutonium. High rate of solid-phase reactions in titanate systems allows the equilibrium to be attained at a moderate temperature (1400°C) within short sintering time (the first hours). One more possible procedure for matrix fabrication is cold crucible induction melting followed by the melt crystallization.
Starting Page	187
Ending Page	199
Page Count	13
File Format	PDF
ISSN	10663622
Journal	Radiochemistry
Volume Number	57
Issue Number	2
e-ISSN	16083288
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-04-15
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	radioactive waste immobilization rare earth-actinide fraction pyrochlore matrices Nuclear Chemistry Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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