Rosu-Finsen, Alexander;
Davies, Michael B;
Amon, Alfred;
Wu, Han;
Sella, Andrea;
Michaelides, Angelos;
Salzmann, Christoph G;
(2023)
Medium-density amorphous ice.
Science
, 379
(6631)
pp. 474-478.
10.1126/science.abq2105.
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Abstract
Amorphous ices govern a range of cosmological processes and are potentially key materials for explaining the anomalies of liquid water. A substantial density gap between low-density and high-density amorphous ice with liquid water in the middle is a cornerstone of our current understanding of water. However, we show that ball milling "ordinary" ice Ih at low temperature gives a structurally distinct medium-density amorphous ice (MDA) within this density gap. These results raise the possibility that MDA is the true glassy state of liquid water or alternatively a heavily sheared crystalline state. Notably, the compression of MDA at low temperature leads to a sharp increase of its recrystallization enthalpy, highlighting that H2O can be a high-energy geophysical material.
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