Unexpectedly stable clathrate hydrates formed from microporous vapor-deposited amorphous solid water at low 'external' guest pressures and their astrophysical implications

Journal Article · Fri Mar 01 00:00:00 EST 1991 · Icarus (International Journal of the Solar System); (USA)

DOI:https://doi.org/10.1016/0019-1035(91)90078-8· OSTI ID:5638058

Hallbrucker, A; Mayer, E ^[1]

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1. Innsbruck Universitaet (Austria)

The formation of O{sub 2}-clathrate hydrate from O{sub 2} trapped in micropores of vapor-deposited amorphous water ice during heating and sintering at temperatures up to 120 K and 'external' O{sub 2} pressures 10, 100, 200, and 1000 mbar is reported. X-ray diffraction studies show that the clathrate hydrate forms at 170-210 K, even at the lowest O{sub 2} pressure (10 mbar) and does not decompose until the temperature reaches 240-250 K (significantly higher than predicted previously). The importance of the presence and sintering properties of micropores in amorphous water ice for theoretical models of clathrate hydrate formation in the solar system is indicated. 44 refs.

• OSTI ID: 5638058
• Journal Information: Icarus (International Journal of the Solar System); (USA), Vol. 90; ISSN 0019-1035
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
HYDRATES
COSMOCHEMISTRY
SOLAR SYSTEM
CHEMICAL COMPOSITION
AMORPHOUS STATE
CHEMICAL REACTION KINETICS
CLATHRATES
DEPOSITION
HEATING
ICE
POROSITY
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION
CHEMISTRY
COHERENT SCATTERING
DIFFRACTION
KINETICS
REACTION KINETICS
SCATTERING
640107* - Astrophysics & Cosmology- Planetary Phenomena