Phase Transformations and Metallization of Magnesium Oxide at High Pressure and Temperature-Reference-Cited by-同舟云学术

Phase Transformations and Metallization of Magnesium Oxide at High Pressure and Temperature

Published:2012-12-07 Issue:6112 Volume:338 Page:1330-1333
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

McWilliams R. Stewart¹²,Spaulding Dylan K.³,Eggert Jon H.⁴,Celliers Peter M.⁴,Hicks Damien G.⁴,Smith Raymond F.⁴,Collins Gilbert W.⁴,Jeanloz Raymond³⁵

Affiliation:

1. Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015, USA.

2. Howard University, 2400 Sixth Street, NW, Washington, DC 20059, USA.

3. Department of Earth and Planetary Science, University of California, Berkeley, CA 94707, USA.

4. Physics Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.

5. Department of Astronomy and Miller Institute for Basic Research in Science, University of California, Berkeley, CA 94720, USA.

Abstract

Planetary Interiors Under Pressure The interiors of Earth and other rocky planets generally consist of a few common minerals. Depending largely on the size of the planet, the distribution and relative abundance of these minerals varies; for example, MgO is abundant in the mantles of Earth and large Earth-like planets, but is present in Jupiter's core. The properties of MgO also vary with planetary size as a function of temperature and pressure. McWilliams et al. (p. 1330 , published online 22 November) performed laser-shock experiments at pressures over three times higher than Earth's inner core. MgO underwent two phase transformations, first to a solid with a modified crystal structure, and then to a conductive liquid. In terrestrial planets greater than eight Earth masses, MgO in the mantle could generate a magnetic field–generating dynamo such as those that typically found in planetary cores.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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