The crystal structures of UVO, [space group Pbcm, a=4.1231(1) A, b=12.3641(1) A, c=7.2071(1) A, Z=4] and Cs, (UO, ), V, O, [space group P2,/a1 a = 10.521(2) A, b=8.4369(9) A, c=7.308(3) A, p= 106.08(1)", Z = 2 ] , previously obtained by single-crystal X-ray diffraction, were refined using powder neutron diffraction and Rietveld analysis adapted to time-of-flight data. The main structural features of the two compounds were confirmed but more accurate oxygen positions are reported here.
The crystal structure of CuU,O,, has been determined by refinement of powder neutron diffraction data; space group P i , Z = 2 , a=6.516(5) A, b=7.614(2) A, c=5.615(7) A, a= 109.464( 9)", fi= 125.18(2)", y=89.993(3)". The structure is related to that of USbO,.
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