Touching the holy grail of gas hydrate research: The empty clathrate, a new crystalline form of ice
A previous experiment (5-25-209) has allowed us to find a way to the empty clathrate hydrate structure, a phase of prime interest in gas hydrate research. This time we want to fully achieve this goal by pumping on Ne-hydrate and, in this way, form a new phase of ice which is topologically related to the so-called structure II clathrate hydrate; it is predicted theoretically as the most stable crystalline phase of water at negative pressures. This phase should have a negative thermal expansion, which we want to demonstrate experimentally by measuring its temperature-dependent lattice constant. We also plan to measure the emptying of the cages by pumping out the neon atoms in situ at various temperatures in order to elucidate the activation energy of the cage-to-cage migration of neon atoms in bulk hydrate.
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KUHS Werner Friedrich; BARTELS Heiner; FALENTY Andrzej; Thomas C. Hansen; KAHMANN Ulf and SEIDLER Christian. (2013). Touching the holy grail of gas hydrate research: The empty clathrate, a new crystalline form of ice. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-25-217
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