Other
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3115618m&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 15, CiteID L15618
Other
8
Geochemistry: Composition Of The Core, Mineral Physics: High-Pressure Behavior, Mineral Physics: Nmr, Mossbauer Spectroscopy, And Other Magnetic Techniques, Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction
Scientific paper
We studied the nuclear resonant x-ray scattering of iron hydride (FeHx) up to 52 GPa. Coupled with hydrostatic x-ray diffraction data, the partial phonon density of states measured by nuclear resonant inelastic x-ray scattering provides information on sound velocities and the Fe contribution to thermodynamic parameters. In particular it constrains the aggregate shear velocity and shear modulus for comparison to seismic observations. We found that VS (km/sec) = 0.023*P (GPa) + 3.2. A loss of magnetism was observed with synchrotron Mössbauer spectroscopy at 22 GPa, lower than theoretically predicted but consistent with the observed anomalous velocity behavior. Results confirm that FeHx could be a major light element bearing phase for explaining the core density deficit relative to pure Fe. Formation of FeHx by reaction with water would be expected to leave a signature in the mantle.
Heinz Dion L.
Hemley Russell J.
Mao Ho-kwang
Mao Wendy L.
Shu Jin-fu
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