Abstract
SYNROC specimens were synthesized by three different methods: hot uniaxial pressing (HUP), hot isostatic pressing (HIP), and atmospheric sintering (AS). Textures of the SYNROC specimens and distribution of waste elements among the constituent phases were examined by analytical transmission electron microscopy. The specimens synthesized by HUP and HIP show dense texture and contain small alloys mainly at boundaries of grains of perovskite, hollandite, zirconolite, and magnetoplumbite. They may also contain small amounts of glasses at grain boundaries. The same crystalline phases are formed in the specimen synthesized by AS as those in the specimens synthesized by HUP and HIP, but the crystals are larger than those formed by HUP and HIP. The specimen synthesized by AS also contains rutile and a Zr-rich phase as minor phases, and glasses at grain boundaries. Mo, Cs, and Na are the components of the glasses of the specimen synthesized by AS. The preliminary leach test revealed that high dissolution of Mo and Cs at the early stage of leaching was closely related to the glasses in the specimens.
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