Abstract
Lanthanide aluminosilicate glasses have been developed for their high mechanical properties. Nevertheless, little is known about their chemical durability and the role of rare-earth elements on the dissolution mechanisms of such glasses. This type of glass appears to be a suitable complement waste forms of borosilicate glass for the specific immobilisation of trivalent actinides. The first part of this paper deals with the synthesis and the characterisation of glasses in the system SiO 2–Al 2O 3–Y 2O 3–Ln 2O 3 (with Ln=La or Ce) and the second part with the study of their leachability in deionised water using a reflux column at 100°C. Hydrated glass surfaces have been examined with scanning electron microscopy coupled with X-ray microanalysis and nuclear microanalysis. Leachates have been characterised by using ICP-MS and UV-visible spectrophotometry. After leaching, the formation of a surface layer slightly depleted in Si and Al and containing Y and La hydroxicarbonates and hydroxides is discussed.
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