Phase transition of FeO and stratification in earth's outer core

Haruka Ozawa, Futoshi Takahashi, Kei Hirose, Yasuo Ohishi, Naohisa Hirao

研究成果: Contribution to journalArticle査読

40 被引用数 (Scopus)

抄録

Light elements such as oxygen in Earth's core influence the physical properties of the iron alloys that exist in this region. Describing the high-pressure behavior of these materials at core conditions constrains models of core structure and dynamics. From x-ray diffraction measurements of iron monoxide (FeO) at high pressure and temperature, we show that sodium chloride (NaCl)-type (B1) FeO transforms to a cesium chloride (CsCl)-type (B2) phase above 240 gigapascals at 4000 kelvin with 2% density increase. The oxygen-bearing liquid in the middle of the outer core therefore has a modified Fe-O bonding environment that, according to our numerical simulations, suppresses convection. The phase-induced stratification is seismologically invisible but strongly affects the geodynamo.

本文言語英語
ページ(範囲)792-794
ページ数3
ジャーナルScience
334
6057
DOI
出版ステータス出版済み - 11 11 2011
外部発表はい

All Science Journal Classification (ASJC) codes

  • General

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