Fig. 7: A schematic phase diagram showing the transition- and crystallization temperatures of three eHDA samples measured at different pressures.

Sample A (red) and B (green) transform predominantly to LDL (and ice I). Sample D (black triangle) crystallizes directly to ice IX. From sample B, Tg was determined by XPCS at ~0.08 GPa and 123 K (black spot). Other literature values for the glass transition Tg are shown for comparison, determined by different experimental methods as cited in the references.