Abstract
The crystal structure of meta-uranocircite II, Ba(UO2)2(PO4)2·6H2O, has been determined with a synthetic crystal using three-dimensional X-ray techniques.R=0.071 andR w =0.064 were obtained for 1743 observed reflections. Ba(UO2)2(PO4)2·6H2O is monoclinic, space groupP1121/a, a=9.789,b=9.822,c=16.868 A, γ=89.95° andZ=4. The structure consists of slightly corrugated UO2PO4 layers parallel (001). The layers are connected by Ba atoms and H2O molecules. Uranium exhibits a (2+4)-coordination with mean U-O bond lengths of 1.78 A for the uranyl oxygens and 2.28 A for the phosphate oxygens. The average P-O bond length is 1.52 A. Barium is coordinated by two uranyl oxygens. two phosphate oxygens and five water molecules. The Ba−O bond lengths vary from 2.74 to 3.11 A. Two of the six water molecules of the formula are not bonded to barium.
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