Polycrystalline Methane Clathrate: A New Method of In Situ Synthesis, and Its Phase Stability and Rheology at High Pressures

Physics

Scientific paper

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Clathrate, Deformation, Methane, Outer Solar System, Rheology

Scientific paper

Methane is an important molecule in the outer solar system and is expected to form the icy clathrate structure (CH4-6H2O) in appreciable amounts on the solid planets and moons of the outer solar system where both water and methane are abundant. Methane clathrate also occurs commonly in offshore methane-bearing sediments, and is the largest untapped hydrocarbon source on Earth. Prior work on this compound has been hampered by the difficulty in synthesizing cohesive polycrystalline aggregates suitable for physical property measurement. We have successfully made such aggregates, deformed them at low temperatures and elevated pressures and examined their deformation microstructures as guides to the deformation processes that control their rheology. We found that the growth and deformation properties of this compound to be very peculiar and interesting.

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