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Researchers discovered a new methane hydrate IV (MH-IV) structure at high pressures. This methane-water phase, stable up to 150 GPa, advances understanding of gas hydrates and their properties.

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Gas hydrates, water frameworks with guest gas molecules, are crucial for understanding hydrophobic interactions and have energy applications.
  • Methane hydrate III (MH-III) is stable above 2 GPa, with methane in water or deuterium oxide channels.
  • The existence of a new high-pressure phase beyond MH-III has been conjectured but not confirmed.

Purpose of the Study:

  • To investigate the existence and structure of a new high-pressure phase of methane-deuterium oxide hydrate.
  • To determine the stability limits of methane hydrate phases at extreme pressures.
  • To provide insights into the behavior of gas hydrates under high-pressure conditions.

Main Methods:

  • Raman spectroscopy using a diamond anvil cell.
  • Ab initio molecular dynamics simulations incorporating nuclear quantum effects.
  • Analysis of previously unresolved X-ray diffraction data.

Main Results:

  • Evidence for a new methane hydrate IV (MH-IV) structure forming around 40 GPa.
  • The MH-IV structure remains stable up to at least 150 GPa at room temperature.
  • The MH-IV structure features a deuterium oxide network isomorphic with hexagonal ice (ice Ih), with methane intercalated within the tetrahedral network.
  • This structure is consistent with prior unresolved X-ray diffraction data at 55 GPa.

Conclusions:

  • The discovery of MH-IV represents the highest-pressure gas hydrate documented to date.
  • The transition from MH-III to MH-IV involves a complex mechanism.
  • Repulsive methane-water interactions dominate at these extreme pressures, favoring space-filling tetrahedral arrangements.