U4O9: atoms in general sites giving the hkl extinctions of special sites
In U4O9, most of the atoms are in general 48-fold [48(e)] sites of the space group I 3d and yet the hkl reflections obey the extinction rules for atoms occupying special 12-fold [12(b)] sites. An explanation is given for this effect, which can be generalized to any space group.
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