Titanate-based ceramic as a matrix for curium and rare earth element fraction of radioactive waste immobilization

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Abstract

The effective isolation of radioactive waste (RW) from the environment is the main problem for the further development of nuclear power. The main phases in titanate-based ceramics are perovskite, rutile, zirconolite and murataite. Murataite grains have a zonal structure with high content of rare earth elements at the center of structure and low content of these at edges, that precludes their leaching in contact with a solution. Murataite-based ceramics containing simulated rare earth elements of high level waste (HLW) were produced via melting of oxide mixtures in a resistance furnace at 1500°C. All samples were composed of mainly murataite and minor perovskite, crichtonite, zirconolite, and pyrophanite/ilmenite phases. Thus, murataite is the dominant host phase for a sample containing zirconium oxide. All samples were analyzed by scanning electron microscopy with an energy dispersive X-ray spectroscopy. Elemental leaching rates from the ceramic with low perovskite content were lower by one order of magnitude then leaching rates for high perovskite content.

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Danilov, S. S., Frolova, A. V., Vinokurov, S. E., Yudintsev, S. V., & Myasoedov, B. F. (2020). Titanate-based ceramic as a matrix for curium and rare earth element fraction of radioactive waste immobilization. In RAD Conference Proceedings (Vol. 4, pp. 138–141). RAD Association. https://doi.org/10.21175/RadProc.2020.29

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