Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3824301f&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 24, CiteID L24301
Physics
2
Mineralogy And Petrology: Reactions And Phase Equilibria (1012, 8412), Mineral Physics: Electrical Properties, Mineral Physics: High-Pressure Behavior, Mineral Physics: Physical Thermodynamics, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction
Scientific paper
Wüstite, Fe1-xO, is an important component in the mineralogy of Earth's lower mantle and may also be a component of the core. Therefore its high pressure-temperature behavior, including its electronic structure, is essential to understanding the nature and evolution of Earth's deep interior. We performed X-ray diffraction and radiometric measurements on wüstite in a laser-heated diamond anvil cell, finding an insulator-metal transition at high pressures and temperatures. Our data show a negative slope for this apparently isostructural phase boundary, which is characterized by a volume decrease and emissivity increase. The metallic phase of FeO is stable at conditions of the lower mantle and core, which has implications for the high P-T character of Fe-O bonds, magnetic field propagation, and lower mantle conductivity.
Campbell Andrew J.
Dera Przemyslaw
Fischer Rebecca A.
Lord Oliver T.
Prakapenka Vitali B.
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