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Figure 1
(a) Representation of the cubic arrangement of the eight nearest UO6 bi-pyramids around the alkali metals in NaUO3, KUO3 and RbUO3. The projection view is along the normal of the (723) plane. (b) Representation of the oxygen bi-pyramid around uranium for NaUO3, KUO3 and RbUO3. For an easy comparison between all three uranates, all the apices are oriented along z, i.e. without the expected tilt shown in (a), but the rotation of the base around the z axis is shown. The distortion in terms of U–O distances (contraction and elongation) is marked with light green arrows, relative to KUO3. Nonequivalent distances between uranium and each of the oxygen atoms forming the apices Oa and the base Ob of the bi-pyramid are shown, using the same color as the oxygen atoms they refer to (e.g. blue and red Ob in the case of NaUO3). Main angles between atoms are also indicated. This figure was partially created using the VESTA 3 software (Momma & Izumi, 2011View full citation).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 5| September 2025| Pages 1257-1264
https://doi.org/10.1107/S1600577525005156
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