Cooler than ice: The structural and thermodynamic properties of high-density amorphous ice (HDA) prepared from two different starting materials, cubic ice and hexagonal ice, are compared. The resulting HDA states, have similar densities, however as shown by X-ray structure factors (see figure) and differential scanning calorimetry, they differ in structure and enthalpy.
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Loerting et al. (2006) studied this question.
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