Characterization of modified murataite based ceramics as a perspective hosts for actinides, fission, and corrosion products of HLW
Abstract
Murataite-based ceramics containing 10 wt% rare earth (REs = La, Ce, Nd, Ho) or actinide (An = Th, U) oxides were produced in a resistive furnace at a temperature of 1500 °C. The samples were composed of major murataite-type phases and minor perovskite, crichtonite, and zirconolite/pyrochlore. Light (Ce-group) REs are concentrated in the perovskite whereas Nd and Ho are mainly accommodated in the murataite. U and Th enter predominantly murataite. Ce and U regardless from their oxidation state in the batch (Ce2O3/CeO2, UO2/UO3) exist in the murataite as Ce(III) or U(IV) with some contribution due to U(V) for the uranium-doped sample.
- Publication:
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Journal of Nuclear Materials
- Pub Date:
- February 2020
- DOI:
- 10.1016/j.jnucmat.2019.151958
- Bibcode:
- 2020JNuM..52951958S
- Keywords:
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- Actinide;
- Rare earth;
- Murataite-based ceramics;
- Raman spectroscopy;
- Scanning electron microscopy;
- X-ray absorption near-edge spectroscopy;
- X-ray diffraction