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Thermodynamically Stable Intermediate in the Course of Hydrogen Ordering from Ice V to Ice XIII
Keishiro Yamashita1, Thomas Loerting1
1Institute of Physical Chemistry, University of Innsbruck, Innrain 52c, 6020 Innsbruck, Austria.
Abstract:
Even though many partially ordered ices are known, it remains elusive to understand and categorize them. In this study, we study the ordering from ice V to XIII using calorimetry at ambient pressure and discover that the transition takes place via an intermediate that is thermodynamically stable at 113-120 K. Our isothermal ordering approach allows us to highlight the distinction of this intermediate from ice V and XIII, where there are clear differences both in terms of enthalpy and ordering kinetics. We suggest that the approach developed in the present work can also reveal the nature of partially ordered forms in the hydrogen order-disorder series of other ice phases.
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