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Figure 6
Gravimetric water vapour sorption–desorption isotherms of OZPN (a) form I, (b) dihydrate B, (c) dihydrate D and (d) dihydrate E/2.5 hydrate. Water content was measured in 5% RH increments starting at 30% RH, increasing to 95% RH (blue circles), then decreasing to 0% RH (red circles).

IUCrJ
Volume 7| Part 6| November 2020| Pages 955-964
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520012683