Abstract
Glass-ceramic matrices containing zirconolite (nominally Ca(Zr,Hf)Ti2O7) crystals in their bulk that would incorporate high proportions of minor actinides (Np, Am, Cm) or plutonium could be envisaged for their immobilization. Zirconolite-based glass-ceramics can be prepared by controlled crystallization of zirconolite in glasses belonging to SiO2–Al2O3–CaO–Na2O–TiO2–ZrO2–HfO2 system. In this study, neodymium was used as trivalent actinides surrogate. Increasing Al2O3 concentration in glass composition had a strong effect on the nucleation rate I z of zirconolite crystals in the bulk, on the amount of neodymium incorporated in zirconolite phase and on the crystal growth rate of silicate phases (titanite + anorthite) from glass surface. These results could be explained by the existence of competition—in favor of aluminum—between Al3+ and (Ti4+, Zr4+, Hf4+) ions for their association with charge compensators cations to facilitate their incorporation in the glassy network. Differential thermal analysis (DTA) was used to study exothermal effects associated with bulk and surface crystallization. 27Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectra showed that aluminum enters glasses network predominantly in 4-fold coordination. Neodymium optical absorption and fluorescence spectroscopies showed that the Al2O3 concentration changes performed in this study had not significant effect on Nd3+ ions environment in glasses.
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Acknowledgements
The CEA (Commissariat à l’Energie Atomique) and the French Group Nomade are gratefully acknowledged for their financial supports to this study. The authors would like also to thank Prof. G. Bodenhausen (Ecole Normale Supérieure, Paris) who made possible the 27Al MAS NMR experiment at 14.1 T. The authors also thank Dr. T. Charpentier and Dr. M. Gaillard (CEA Saclay, France) for recording of 27Al 3QMAS NMR spectrum.
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Caurant, D., Loiseau, P., Bardez, I. et al. Effect of Al2O3 concentration on zirconolite (Ca(Zr,Hf)Ti2O7) crystallization in (TiO2,ZrO2,HfO2)-rich SiO2–Al2O3–CaO–Na2O glasses. J Mater Sci 42, 8558–8570 (2007). https://doi.org/10.1007/s10853-007-1810-8
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DOI: https://doi.org/10.1007/s10853-007-1810-8