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Figure 6
Model 2. Hg ions do not move. (a) O3 moves δ = ±0.37 along b. (b) O3 moves δ = ±0.37 and Ba moves δ = ±0.3. The O3 valence in (a) is 1.749 and in (b) is 1.965.

IUCrJ
Volume 3| Part 5| September 2016| Pages 309-318
ISSN: 2052-2525
doi:10.1107/S2052252516010629