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![[Figure 4]](ks5224fig4mag.jpg)
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Figure 4
A schematic T–X slice through the P–T–X phase diagram at ∼450 MPa, indicating the sequence of events that probably occurred in experiment 1 after melting and subsequent cooling. The specimen of ADH + ice IX was warmed from 174 K (i) to 179 K (ii), resulting in partial melting to ice + liquid. The composition of the liquid co-existing with the ice phase is indicated by (iii). On cooling back to 174 K, the liquid crystallizes the stable ice phase under these P,T conditions (ice II) and the composition evolves down the liquidus towards (iv). At the end of the metastable extension of the ice II liquidus (dashed black line), the residual supercooled liquid has a composition far into the ADH + AMH stability field, co-crystallizing high-pressure phases of each compound. The approximate degree of undercooling for each phase is marked, being greatest for ice II and least for AMH II; the maximum growth rates appear to be proportional to the degree of undercooling. |
![[Figure 4]](ks5224fig4.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
