Tungstate-based glass-ceramics for the immobilization of radio cesium

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dc.contributor.authorDrabarek, Een_AU
dc.contributor.authorMcLeod, TIen_AU
dc.contributor.authorHanna, JVen_AU
dc.contributor.authorGriffith, CSen_AU
dc.contributor.authorLuca, Ven_AU
dc.date.accessioned2010-04-06en_AU
dc.date.accessioned2010-04-30T05:09:06Zen_AU
dc.date.available2010-04-06en_AU
dc.date.available2010-04-30T05:09:06Zen_AU
dc.date.issued2009-02-15en_AU
dc.date.statistics2009-02-15en_AU
dc.description.abstractThe preparation of tungstate-containing glass–ceramic composites (GCC) for the potential immobilization of radio cesium has been considered. The GCC materials were prepared by blending two oxide precursor compositions in various proportions. These included a preformed Cs-containing hexagonal tungsten bronze (HTB) phase (Cs0.3Ti0.2W0.8O3, P63/mcm) and a blend of silica and other oxides. The use of the HTB phase was motivated on the assumption that a HTB-based adsorbent could be used to remove cesium directly from aqueous high level liquid waste feeds. In the absence of the HTB, glass–ceramics were relatively easily prepared from the Cs-containing glass-forming oxide blend. On melting the mixture a relative complex GCC phase assemblage formed. The principal components of this phase assemblage were determined using X-ray powder diffraction, 133Cs MAS-NMR, and cross-sectional SEM and included glass, various zeolites, scheelite (CaWO4) and a range of other oxide phases and Cs-containing aluminosilicate. Importantly, under no circumstance was cesium partitioned into the glass phase irrespective of whether or not the composition included the preformed Cs-containing HTB compound. For compositions containing the HTB, cesium was partitioned into one of four major phases including zeolite; Cs–silica–tungstate bronze, pollucite (CsAlSi2O6), and an aluminosilicate with an Al/Si ratio close to one. The leach resistance of all materials was evaluated and related to the cesium distribution within the GCC phase assemblages. In general, the GCCs prepared from the HTB had superior durability compared with materials not containing tungsten. Indeed the compositions in many cases had leach resistances comparable to the best ceramics or glass materials. © 2009, Elsevier Ltd.en_AU
dc.identifier.citationDrabarek, E., McLeod, T. I., Hanna, J. V., Griffith, C. S., & Luca, V. (2009). Tungstate-based glass-ceramics for the immobilization of radio cesium. Journal of Nuclear Materials, 384(2), 119-129. doi:10.1016/j.jnucmat.2008.11.018en_AU
dc.identifier.govdoc1586en_AU
dc.identifier.issn0022-3115en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleJournal of Nuclear Materialsen_AU
dc.identifier.pagination119-129en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jnucmat.2008.11.018en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3031en_AU
dc.identifier.volume384en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectTungstatesen_AU
dc.subjectCeramicsen_AU
dc.subjectGlassen_AU
dc.subjectCesiumen_AU
dc.subjectSolidificationen_AU
dc.subjectVitrificationen_AU
dc.titleTungstate-based glass-ceramics for the immobilization of radio cesiumen_AU
dc.typeJournal Articleen_AU
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