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Nature of the pressure-induced collapse of an ice clathrate by dielectric spectroscopy
Umeå University, Faculty of Science and Technology, Physics. Umeå University, Faculty of Science and Technology, Physics.
2008 (English)In: Journal of Chemical Physics, ISSN 0021-9606, Vol. 129, 234505- p.Article in journal (Refereed) Published
Abstract [en]

Collapse of an ice clathrate of type II structure containing tetrahydrofuran as guest molecules has been studied at different pressures by dielectric spectroscopy. The sample was pressurized to 1.3 GPa at 130 K and the resulting collapsed state was pressure cycled. The dielectric relaxation time increases at a progressively rapid rate during pressurizing and then decreases slowly on depressurizing, but the dielectric relaxation time does not reach the value of the original state. With increase in pressure, the limiting high frequency permittivity due to orientation of H2O molecules first increases by about 5% until 0.75 GPa and then decreases slightly until 1 GPa, and finally it increases until ~1.2 GPa. The decrease is attributed to the loss of contribution from the reorientational motion of tetrahydrofuran molecules and the increase to densification as the structure mechanically collapses completely in the 1–1.25 GPa range. The relaxation time of the collapsed state is comparable with that of the high-density amorph formed on pressure collapse of ice.

Place, publisher, year, edition, pages
2008. Vol. 129, 234505- p.
Keyword [en]
dielectric relaxation, clathrate hydrate, high pressure
URN: urn:nbn:se:umu:diva-11413DOI: doi:DOI:10.1063/1.3039760OAI: diva2:151084
Available from: 2009-01-01 Created: 2009-01-01Bibliographically approved

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