期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 44, 期 2, 页码 1102-1114出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2023.09.071
关键词
Nuclear wasteform; Multicomponent pyrochlore; Passivation film; Chemical durability
Chemical durability of compositionally-complex rare-earth titanate pyrochlore solid solutions with or without uranium incorporation was investigated. Elemental release was found to be strongly correlated with chemical disorder, with a negligible correlation with entropy. Controlling composition complexity and chemical disorder can enhance waste form performance with improved chemical durability.
Chemical durability of compositionally-complex rare-earth titanate pyrochlore solid solutions with or without uranium incorporation was investigated by semi-dynamic leaching testing. A Ti-enriched amorphous passivation film formed on the surface due to the surface alteration-reorganization mechanism with preferential release of the weakly oxygen-bonded rare earth elements. Elemental release was found to be strongly correlated with chemical disorder, with a negligible correlation with entropy. The release rate of the uranium gradually decreased with increasing numbers of components, implying a possibility of designing and optimizing waste form performance with enhanced chemical durability by controlling composition complexity and chemical disorder for effective nuclear waste management.
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