Glass ceramics and ceramics based on the mineral sphene (CaTiSiO5) are being developed to host the wastes arising from possible future CANDU* fuel reprocessing. Results from leaching tests in deionized water and in synthetic groundwater indicate that these materials are highly durable. Secondary Ion Mass Spectrometry (SIMS) depth profiling of leached specimens suggests that leaching in the glass ceramics is predominantly confined to the glass phase. The high ionic strength and composition of the groundwater have a significant passivating effect on leaching and surface alteration phenomena, and encourage the precipitation of new phases on the ceramic surface. Leaching results, scanning electron microscope (SEM) observations and SIMS depth profile measurements are compared and discussed.
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Hayward, P.J., Hocking, W.H., Doern, F.E. et al. Sims Depth Profiling Studies of Sphene-Based Ceramics and Glass Ceramics Leached in Synthetic Groundwater. MRS Online Proceedings Library 11, 319 (1981). https://doi.org/10.1557/PROC-11-319