Abstract
Plutonyl orthosilicate dihydrate (PuO2)2SiO4·2H2O was prepared by a hydrothermal procedure at 180°C. Its powder diffraction pattern (Guinier camera, CuKα1 radiation) was indexed in the tetragonal crystal system: a 6.912(3), c 18.563(3) A, space group I41/amd. The structure of (PuO2)2SiO4·2H2O is similar to the known structures of (UO2)2SiO4·2H2O and (UO2)2GeO4·2H2O, but differs in the mutual orientation of the chains of coordination polyhedra of actinide atoms (pentagonal bipyramids) sharing common equatorial edges.
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