Abstract
The problem of development of a ceramic phosphate matrix for solidification of the lanthanideactinide fraction of radioactive wastes is tackled from the crystal-chemical viewpoint. New double orthophosphates of tetravalent f elements (Ce, Th, U, Np, Pu) with alkaline-earth elements and cadmium of the formulas B0.5M2(PO4)3 and B1.5M1.5(PO4)3 (B = Mg, Ca, Sr, Ba, Cd; M = Ce, Th, U, Np, Pu) were prepared. The compounds were characterized by X-ray diffraction (including high-temperature measurements) and IR spectroscopy. They crystallize in the monazite structural type (space group P21/n). The thermal behavior of the compounds was studied. The unit cell parameters of the phases synthesized were determined. The influence of the cationic composition on the structure formation is analyzed.
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Kitaev, D.B., Volkov, Y.F. & Orlova, A.I. Orthophosphates of Tetravalent Ce, Th, U, Np, and Pu with the Monazite Structure. Radiochemistry 46, 211–217 (2004). https://doi.org/10.1023/B:RACH.0000031674.74780.a8
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DOI: https://doi.org/10.1023/B:RACH.0000031674.74780.a8