Abstract
Titanates and titanate- or titanosilicate-based ceramics are being considered as possible nuclear waste hosts in several national waste management programmes1–4, largely because of their excellent resistance to leaching. The leach resistance of titanates has been attributed to the formation of largely insoluble, titanium dioxide rich layers, formed at the surface by selective leaching of univalent and divalent cations5. We have examined the leaching of the titanosilicate sphene (CaTiSiO5) in the form of natural samples, sintered ceramics and glasses of stoichiometric sphene composition. We report ESCA (electron spin for chemical analysis) or XPS (X-ray photoelectron spectroscopy) and SIMS (secondary ion mass spectrometry) studies of leached CaTiSiO5 glasses, demonstrating the nature of leached surface layers on a titanosilicate. These results also illustrate the parallels between the leaching of sphene glasses in deionized water and the leaching mechanism proposed for titanates5.
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Bancroft, G., Metson, J., Kanetkar, S. et al. Surface studies on a leached sphene glass. Nature 299, 708–710 (1982). https://doi.org/10.1038/299708a0
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DOI: https://doi.org/10.1038/299708a0
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