Abstract

Barium uranate, BaUO 4, crystallizes in the centro-symmetric orthorhombic space group, Pbcm ( D 2 h 11; No. 57) with a = 5.744(3), b = 8.136(4), c = 8.237(3) A ̊ for M = 439.36 and Z = 4 . X-ray diffraction data complete to 2θ = 60° (Mo Kα radiation) were collected using a G.E. XRD-490 automated diffractometer. The structure was solved by a combination of Patterson, Fourier and least-squares techniques. The final discrepancy indices are R F = 0.059 and wR F = 0.107 for 507 reflections where F 0 > σ ( F 0). Distinct primary U-O bonds and polymeric secondary U-O bonds form a distorted octahedral U(VI) coordination sphere where the U-O bond distances are shown to be highly influenced by the Ba 2+ ion. The apical primary uranium-oxygen bond length is 1.872(12) Å while the basal secondary U-O bond distances are 2.196(6) and 2.223(6) Å.

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