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Diamond-anvil cell observations of a new methane hydrate phase in the 100-MPa pressure range

Journal of Physical Chemistry A

By:
, , , , , , and
DOI: 10.1021/jp002735w

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Abstract

A new high-pressure phase of methane hydrate has been identified based on its high optical relief, distinct pressure-temperature phase relations, and Raman spectra. In-situ optical observations were made in a hydrothermal diamond-anvil cell at temperatures between -40?? and 60 ??C and at pressures up to 900 MPa. Two new invariant points were located at -8.7 ??C and 99 MPa for the assemblage consisting of the new phase, structure I methane hydrate, ice Ih, and water, and at 35.3 ??C and 137 MPa for the new phase-structure I methane hydrate-water-methane vapor. Existence of the new phase is critical for understanding the phase relations among the hydrates at low to moderate pressures, and may also have important implications for understanding the hydrogen bonding in H2O and the behavior of water in the planetary bodies, such as Europa, of the outer solar system.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Diamond-anvil cell observations of a new methane hydrate phase in the 100-MPa pressure range
Series title:
Journal of Physical Chemistry A
DOI:
10.1021/jp002735w
Volume
105
Issue:
19
Year Published:
2001
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Physical Chemistry A
First page:
4664
Last page:
4668
Number of Pages:
5