Phase transition and metallization of FeO at high pressures and temperatures

被引：48

作者：

Fischer, Rebecca A. ^{[1
]}

Campbell, Andrew J. ^{[1
]}

Lord, Oliver T. ^{[3
]}

Shofner, Gregory A. ^{[4
]}

Dera, Przemyslaw ^{[2
]}

Prakapenka, Vitali B. ^{[2
]}

机构：

[1] Univ Chicago, Dept Geophys Sci, Chicago, IL 60637 USA

[2] Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60637 USA

[3] UCL, Dept Earth Sci, London WC1E 6BT, England

[4] Univ Maryland, Dept Geol, College Pk, MD 20742 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2011年 / 38卷

基金：

美国国家科学基金会;

关键词：

SYSTEM; BOUNDARY; CORE; FE0.94O; WUSTITE; DIAGRAM; STATE; TOP;

D O I：

10.1029/2011GL049800

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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. Citation: Fischer, R. A., A. J. Campbell, O. T. Lord, G. A. Shofner, P. Dera, and V. B. Prakapenka (2011), Phase transition and metallization of FeO at high pressures and temperatures, Geophys. Res. Lett., 38, L24301, doi:10.1029/2011GL049800.

引用

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