Phase transition and metallization of FeO at high pressures and temperatures

Rebecca A. Fischer*, Andrew J. Campbell, Oliver T Lord, Gregory A. Shofner, Przemyslaw Dera, Vitali B. Prakapenka

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

36 Citations (Scopus)
326 Downloads (Pure)

Abstract

Wustite, 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 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 P-T character of Fe-O bonds, magnetic field propagation, and lower mantle conductivity.
Original languageEnglish
Article numberL24301
Pages (from-to)1-5
Number of pages5
JournalGeophysical Research Letters
Volume38
Issue number24
Early online date16 Dec 2011
DOIs
Publication statusPublished - 28 Dec 2011

Bibliographical note

Date of Acceptance: 01/11/2011

Keywords

  • Fe0.94O
  • state
  • core-mantle boundary
  • wustite
  • diagram
  • GSECARS
  • nutations
  • system
  • top
  • Earth's core

Cite this