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Surface chemical characterisation of multicomponent titanate powders
Journal article   Peer reviewed

Surface chemical characterisation of multicomponent titanate powders

John R Bartlett and J L Woolfrey
Key Engineering Materials, Vol.53-55, pp.679-685
1991
DOI: https://doi.org/10.4028/www.scientific.net/KEM.53-55.679
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https://doi.org/10.4028/www.scientific.net/KEM.53-55.679View
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Abstract

Engineering
Synroc is a multicomponent, multiphase, titanate ceramic designed to immobilise high level waste (HLW) from nuclear reactors. The Synroc concept involves immobilising the elements present in HLW within an assemblage of thermodynamically stable mineral phases (hollandite, zirconolite and perovskite). These minerals are formed during calcination and hot-pressing of a precursor powder containing TiO2, ZrO2, Al2O3, BaO, and CaO in relative mass abundances of (70.4 to 76.4), (5.5 to 8.5), (3.5 to 5.5), (4.6 to 6.6) and (10.1 to 12.1) percent, respectively. Synroc powders are typically produced by advanced chemical methods involving alkoxide hydrolysis. The detailed chemistry of these methods has been described previously. This paper investigates the relationship between surface speciation and powder processing techniques, and examines methods for controlling interfacial chemical processes by selection of processing parameters.

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Web Of Science research areas
Chemistry, Applied
Engineering, Mechanical
Materials Science, Ceramics
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