May 192004

Acta. Cryst. (2004), A60, 322-325. [ doi:10.1107/S010876730401219X ]

β-U4O9 is a superlattice structure based on the fluorite arrangement of UO2.  The U atoms occupy positions close to those in UO2 and the additional O atoms are accommodated in cuboctahedral clusters of -43m symmetry, which are centred on the special 12-fold sites of the cubic space group I43d. The structure has been refined from single-crystal neutron data in accordance with the procedure described in the previous paper [Popa & Willis (2004). Acta Cryst. A60, 318-321].

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