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Figure 16
Relative compression (V/V0) curves for water ice (solid black line) and ammonia dihydrate (dashed red line) derived from the measurements reported in this paper, at temperatures of 185 ± 15 K. This summary plot shows that the volume contrasts through the two ADH phase transitions (ADH I → ADH II and ADH II → ADH IV) are each smaller than those found in the water ice system (ice Ih → ice II and ice II → ice VI). However, the ADH polymorphs are all more compressible than the equivalent water ice phases at the same pressures; this is manifested as the steeper sub-horizontal lines. The combined effect is that both water ice and ADH experience similar overall degrees of densification (∼35%) over the range 0 < P < 2 GPa.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 42| Part 5| September 2009| Pages 846-866
doi:10.1107/S0021889809027897
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