| Autor: |
Zhong, M.-X., Walkley, B., Bailey, D.J., Blackburn, L.R., Ding, H., Wang, S.-Q., Bao, W.-C., Gardner, L.J., Sun, S.-K., Stennett, M.C., Corkhill, C.L., Hyatt, N.C. |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| ISSN: |
0022-3115 |
| Popis: |
A series of zirconolite ceramics with stoichiometry Ca1-xCexZrTi2-2xAl2xO7 (x = 0–0.35), considered as a host phase for the immobilisation of separated plutonium, were prepared from a mixture of oxide precursors by sintering in air at 1450 °C. Ce was utilised as a structural surrogate for Pu, with Al added to provide charge compensation. XRD and electron diffraction analyses indicated crystallisation of the zirconolite-2M polytype for all compositions, accompanied by various secondary phases contingent on the doping level, consistent with microstructure observation. The relative yield of zirconolite phases remained above 94 wt.% for 0.05 < x < 0.20. It was determined that Ce was partially reduced to the Ce3+ oxidation state and Al occupied mainly octahedral Ti sites. The incorporation rate of CeO2 was calculated to be 9.27 wt.% in Ca0.80Ce0.20ZrTi1.60Al0.40O7 with a comparatively high yield of 94.7 wt.%, which is representative of a PuO2 incorporation rate of 14.86 wt.%. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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