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Figure 18
Variation in the observed bond-length ranges for the different coordination numbers of (a) Na+, (b) K+, (c) Rb+ and (d) Cs+ bonded to O2− as a function of the slope of the bond-valence curve at the mean bond-length corresponding to those coordinations. The dashed lines are drawn as a guide to the eye (they are not least-squares fits to the data).

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 72| Part 4| August 2016| Pages 602-625
doi:10.1107/S2052520616008507
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