Abstract
Neutron diffraction studies of (RE 0.5U 0.5)O 2.00 (RE = Y, La, Nd, Ho, Lu) and (La 0.67U 0.33)O 2.00 ternary oxides have proved that these ternary oxides crystallize in the fluorite structure. The oxygen atoms are located on the normal anion sites of the fluorite structure, thus excluding a covalent UO + 2 group. In these ternary oxides the lanthanide atoms as well as U(V) and U(VI) have a nondistorted cubic environment (coordination No. 8), for U(VI) such a coordination is reported for the first time. The mean vibration amplitude of the oxygen atoms ( u 2 S O ) 1 2 and the lattice constant increases with the mean ionic radius of the metal atoms in the (RE 0.5U 0.5)O 2.00 phases.
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