Powder neutron diffraction study of the mixed uranium–vanadium oxides Cs2(UO2)2(V2O8) and UVO5

Abstract

The crystal structures of UVO₅[space group Pbcm, a= 4.1231(1)Å, b= 12.3641 (1)Å, c= 7.2071 (1)Å, Z= 4] and Cs₂(UO₂)₂V₂O₈[space group P2₁/a,a= 10.521(2)Å, b= 8.4369(9)Å, c= 7.308(3)Å, β=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.