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New titanate matrices for immobilization of REE–actinide high-level waste
Ist Teil von
Journal of radioanalytical and nuclear chemistry, 2015-04, Vol.304 (1), p.47-52
Ort / Verlag
Dordrecht: Springer Netherlands
Erscheinungsjahr
2015
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
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.