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Figure 10
Temperature-dependent evolution of the distortions of the coordination spheres of the sodium cations Na2(t = 0.125) and Na2(t = 0.375). Distances are given for Na—O contacts and angles for O—Na—O. The geometry of the coordination sphere of cation Na2(t = 0.125) does not change significantly upon cooling nor at the phase transition between 130 and 120 K, whereas for cation Na2(t = 0.0375) a large distortion occurs involving Na2—O3a contacts.

IUCrJ
Volume 8| Part 1| January 2021| Pages 139-147
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520015912