A combination of X-ray diffraction and high-resolution transmission electron microscopy (HRTEM) has been used to study the crystal structure of molybdenum uranium pentoxide, UMoO 5, obtained by hydrothermal and ceramic methods. Crystal data: Mr-414.0, orthorhombic, Pbaa (number 54), a= 12.746(1), b-7.3494 (7), c=4.1252 (2),~, V=386.4(1),A,3, Z = 4, D x = 7.116 Mg m -3, R -0.037 for 723 reflections. The structure of UMoO5 is related to that of UVOs. Both are built up by slabs of pentagonal UO7 bipyramids with slabs of MO 6 octahedra in-between. They differ in symmetry due to different types of displacement of the M atoms from the ab plane. The HRTEM study revealed a few defect regions in the UMoO 5 crystals prepared by ceramic methods. Energydispersive spectroscopy (EDS) analyses indicate a slight excess of uranium in such crystals. Hypothetical models of defect regions are given.
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