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Shofner, Gregory A.
in Cooperation with on an Cooperation-Score of 37%
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article
Phase transition and metallization of FeO at high pressures and temperatures
Abstract
Wustite, Fe<sub>1-x</sub>O, 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 wustite 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 <i>P-T</i> character of Fe-O bonds, magnetic field propagation, and lower mantle conductivity.