Water in Planets: Dissociation of H2O at High Pressures and Temperatures to a New Form of Oxygen

Details Water in Planets: Dissociation of H2O at High Pressures and Temperatures to a New Form of Oxygen Water in Planets: Dissociation of H2O at High Pressures and Temperatures to a New Form of Oxygen

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.v51a0977b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #V51A-0977

Physics

3919 Equations Of State, 3924 High-Pressure Behavior, 3934 Optical, Infrared, And Raman Spectroscopy, 5709 Composition, 6255 Neptune

Scientific paper

Water is thought to play an important role inside planets, from terrestrial to giant, so the state of the fluid at planetary-interior conditions is of broad interest. Experiments with the laser-heated diamond cell show that H2O dissociates chemically to hydrogen and oxygen upon heating to 2000-5000 K at relatively modest pressures of 6-46 GPa. The presence of H2 and O2, after heating H2O, is confirmed by Raman spectroscopy at pressure. The observed vibron frequencies are in quantitative agreement with published work, indicating the presence of H-H and O=O bonds. X-ray diffraction shows that the oxygen formed from H2O is quenched not to one of the previously known (low-temperature) phases, but to a new phase that is similarly produced upon heating pure O2 at pressures of 3-46 GPa. The new phase of oxygen is monoclinic in symmetry (P 2/m), and exhibits a bulk modulus (K=72 (+/-2) GPa, K'=4) that is high for molecular systems. Formation of the new state of oxygen appears to be thermodynamically important for the process by which H2O breaks down.

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