New titanate matrices for immobilization of REE–actinide high-level waste

New titanate matrices for immobilization of REE–actinide high-level waste

The phases with different structures formed in the series REE 2 Ti x Zr 2− x O 7 ( x  = 0–2) are considered as potential high-level waste (HLW) forms. Matrices were synthesized by cold pressing and sintering. The ceramics were studied by XRD, SEM/EDS, TEM, XAFS. The sample based on monoclinic REE 2...

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Veröffentlicht in:Journal of radioanalytical and nuclear chemistry 2015-04, Vol.304 (1), p.47-52
Hauptverfasser: Livshits, Tatiana S., Zhang, Jiaming, Yudintsev, Sergey V., Stefanovsky, Sergey V.
Format: Artikel
Sprache:eng
Schlagworte:
Ceramics
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Hadrons
Heavy Ions
Immobilization
Inorganic Chemistry
Nuclear Chemistry
Nuclear Physics
Phases
Physical Chemistry
Pyrochlores
Titanates
Transmission electron microscopy
Wastes
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Zusammenfassung:The phases with different structures formed in the series REE 2 Ti x Zr 2− x O 7 ( x  = 0–2) are considered as potential high-level waste (HLW) forms. Matrices were synthesized by cold pressing and sintering. The ceramics were studied by XRD, SEM/EDS, TEM, XAFS. The sample based on monoclinic REE 2 Ti 2 O 7 was irradiated by Kr 2+ (1 MeV). The appearance of the additional monoclinic compound to pyrochlore is observed in the samples at x  > 0.8. The monoclinic REE 2 Ti 2 O 7 is characterized by high isomorphic capacity with respect to REEs. Its radiation resistance is close to Ti-pyrochlores. Monoclinic REE titanate requires further examination as potential host phase for HLW immobilization.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-014-3697-6