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Potential matrices for immobilization of the rare earth-actinide fraction of high-level waste in the REE2Zr2O7-REE2Ti2O7 systemстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 12 июля 2017 г.
- Авторы: Yudintsev S.V., Stefanovsky S.V., Nikonov B.S., Nikol’skii M.S., Livshits T.S.
- Журнал: Radiochemistry
- Том: 57
- Номер: 2
- Год издания: 2015
- Издательство: Pleiades Publishing, Inc.
- Местоположение издательства: New York, USA
- Первая страница: 187
- Последняя страница: 199
- DOI: 10.1134/s1066362215020125
- Аннотация: Phase compositions, structural features, and element distributions were studied for samples of the compositions REE2(Zr2−x Ti x )O7, 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.
- Добавил в систему: Никольский Максимилиан Сергеевич