Experimental study demonstrates high- and low-temperature synthesis routes for multicomponent monazite phosphates, indicating viable low-temperature pathways for nuclear waste sequestration.
The safe management of high-level radioactive waste requires durable waste forms that ensure long-term isolation. Monazite-based (LnPO4) materials are known to be excellent waste form materials. We demonstrated that complex monazite compositions can be synthesized via a facile low-temperature method that can potentially facilitate the sequestration of existing nuclear waste. We investigated flux crystal growth and low-temperature syntheses of complex monazite compositions, including ternary, quaternary, quinary, and senary systems. Single crystals, including AmPO4, were obtained via high-temperature molten flux growth, and their structures were determined. Bulk samples were prepared using a microwave-assisted hydrothermal reaction, and their structures were confirmed via Rietveld refinement.
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Zhoujin et al. (2026) studied this question.
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