Guest disorder and high pressure behavior of argon hydrates

L. Yang; C. A. Tulk; D. D. Klug; B. C. Chakoumakos; L. Ehm; J. J. Molaison; J. B. Parise; J. M. Simonson

doi:10.1016/j.cplett.2009.12.024

Guest disorder and high pressure behavior of argon hydrates

L. Yang, C. A. Tulk, D. D. Klug, B. C. Chakoumakos, L. Ehm, J. J. Molaison, J. B. Parise, J. M. Simonson

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Abstract

The structure of argon hydrate was studied at ambient pressure and low temperature, and between 1.7 and 4.2 GPa at 295 K. This analysis produced a single Ar guest atom, positionally disordered off-center in the large cages of sII. Above 1.7 GPa Ar clathrate transformed to a mixture of a body-centered orthorhombic filled-ice phase, which can be viewed as a polytype of ice-Ih, and high pressure forms of pure ice. The guest disorder is further substantiated by analysis of the guest to host ratio in this high pressure filled-ice structure. The bulk modulus of Ar filled-ice found to be 11.7 ± 0.4 GPa.

Original language	English
Pages (from-to)	104-109
Number of pages	6
Journal	Chemical Physics Letters
Volume	485
Issue number	1-3
DOIs	https://doi.org/10.1016/j.cplett.2009.12.024
State	Published - Jan 18 2010

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10.1016/j.cplett.2009.12.024

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title = "Guest disorder and high pressure behavior of argon hydrates",

abstract = "The structure of argon hydrate was studied at ambient pressure and low temperature, and between 1.7 and 4.2 GPa at 295 K. This analysis produced a single Ar guest atom, positionally disordered off-center in the large cages of sII. Above 1.7 GPa Ar clathrate transformed to a mixture of a body-centered orthorhombic filled-ice phase, which can be viewed as a polytype of ice-Ih, and high pressure forms of pure ice. The guest disorder is further substantiated by analysis of the guest to host ratio in this high pressure filled-ice structure. The bulk modulus of Ar filled-ice found to be 11.7 ± 0.4 GPa.",

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T1 - Guest disorder and high pressure behavior of argon hydrates

AU - Yang, L.

AU - Tulk, C. A.

AU - Klug, D. D.

AU - Chakoumakos, B. C.

AU - Ehm, L.

AU - Molaison, J. J.

AU - Parise, J. B.

AU - Simonson, J. M.

PY - 2010/1/18

Y1 - 2010/1/18

N2 - The structure of argon hydrate was studied at ambient pressure and low temperature, and between 1.7 and 4.2 GPa at 295 K. This analysis produced a single Ar guest atom, positionally disordered off-center in the large cages of sII. Above 1.7 GPa Ar clathrate transformed to a mixture of a body-centered orthorhombic filled-ice phase, which can be viewed as a polytype of ice-Ih, and high pressure forms of pure ice. The guest disorder is further substantiated by analysis of the guest to host ratio in this high pressure filled-ice structure. The bulk modulus of Ar filled-ice found to be 11.7 ± 0.4 GPa.

AB - The structure of argon hydrate was studied at ambient pressure and low temperature, and between 1.7 and 4.2 GPa at 295 K. This analysis produced a single Ar guest atom, positionally disordered off-center in the large cages of sII. Above 1.7 GPa Ar clathrate transformed to a mixture of a body-centered orthorhombic filled-ice phase, which can be viewed as a polytype of ice-Ih, and high pressure forms of pure ice. The guest disorder is further substantiated by analysis of the guest to host ratio in this high pressure filled-ice structure. The bulk modulus of Ar filled-ice found to be 11.7 ± 0.4 GPa.

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DO - 10.1016/j.cplett.2009.12.024

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Guest disorder and high pressure behavior of argon hydrates

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