Partial elimination of the perovskite phase in Synroc
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Date
1989-08
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Journal ISSN
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Publisher
Trans Tech Publications
Abstract
Perovskite is the least durable of the crystalline titanate phases comprising Synroc, a ceramic designed for the immobilisation of high-level waste from nuclear fuel reprocessing. Because 4 perovskite and the other titanate phases (zirconolite, Ba hollandite and reduced titania) are mutually compatible, adjustments to the Synroc mineralogy can be made in principle by adjusting the overall chemical composition. However, the alkoxide route to Synroc is necessary to eliminate perovskite, since perovskite forms metastably and persistently when less reactive precursors to Synroc are employed. The presence of the nuclear waste ions modifies the crystalline phases present and some chemical accounting is necessary to achieve the desired phases constitution. The properties of low-perovskite preparations are compared in detail with those of the current Synroc composition, particularly in regard to leaching and phase constitution.
Description
Physical copy of the journal held by ANSTO Library at DDC: 666/47.
Conference name also called "2nd International Ceramic Conference and Exhibition" on preface.
Keywords
Perovskite, Crystallization, Titanates, Synroc process, High-level radioactive wastes, Radioactive wastes, Metastable states, Ions
Citation
Vance, E. R. & Moricca, S. (1989). Partial elimination of the perovskite phase in Synroc. Presentation to the International Ceramic Conference (AUSTCERAM 90: ceramics technology - sharing the knowledge), Perth, Western Australia, 26-31 August 1990. In Journal of the Australian Ceramic Society, 25(2), 76.