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Figure 1
Illustration of the atomic density wave in the Ba IVb structure. The main structure modulation concerns the displacements of Ba atoms of the guest substructure along the c axis, i.e. along the channels formed by the host Ba atoms, which have been omitted to highlight the chessboard-like distribution of dense and sparse regions. The displacements induce variation in the Ba–Ba distances in the guest substructure. The orange sticks link atoms that sit within 2.90 and 3.8 Å of each other, showing a wave of dense and sparse arrangements of Ba atoms in the guest substructure.

IUCrJ
Volume 4| Part 2| March 2017| Pages 104-105
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517001427