Crystal structure of the binary oxide ?-U3Mo20O64

HREM studies of complex uranium oxides containing molybdenum and tungsten

“…Previous X-ray studies of complex uranium molybdenum oxides [1][2][3][4][5][6], have shown that a series of phases related to the orthorhombic,3 -UMo20g structure can be prepared. The structures can be described as built up of corner-sharing M06-octahedra that form slabs of Re03-type.…”

“…X-ray structure determinations of these phases showed that vacancies were regularly distributed along the linkage plane between the Re03-type slabs. The UMOI0032 structure [5] is shown in figure lb. As can be seen in figure 1, both structures consist of Re03-type slabs two M06-octahedra in width, but the atom arrangements between the slabs are different.…”

“…The composition of the structure model in figure 8c is Uo.s(Mo, W)902s. 4 [11], is the first member (n = 1) of this series and will thus be denoted (l)-PB, while the (3 -UMo20g phase corresponds to (2)-PB. For the members (4)-PB and (5)-PB described above, the Mo-atoms have to a large extent been replaced by W-atoms.…”

Investigation of the luminescence spectrum of UO2MoO4

“…In solid UO2MoO4, however, the cylindrical symmetry of the UO~group is removed. The crystal structure reveals that the uranium ions are coordinated by seven oxygen ions according to a distorted pentagonal bipyramid [10]. The five equatorial oxygen atoms belong to four different MoO4 tetrahedra and one neighbouring UO~group, as shown in fig.…”

“…Here we present an investigation of the emission and excitation spectrum of U02MoO4. The crystal structure of this compound is known [10,11]. The space group is P2l/c-C~hwith four molecules in the monoclinic unit cell.…”