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Phase transition of FeO and stratification in Earth's outer core.(REPORTS)(Author abstract)

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

Science, Nov 11, 2011, Vol.334(6057), p.792(3) [Tạp chí có phản biện]

ISSN: 0036-8075

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  • Nhan đề:
    Phase transition of FeO and stratification in Earth's outer core.(REPORTS)(Author abstract)
  • Tác giả: Ozawa, Haruka ; Takahashi, Futoshi ; Hirose, Kei ; Ohishi, Yasuo ; Hirao, Naohisa
  • Chủ đề: Iron Oxides -- Research ; Phase Transitions (Physics) -- Research
  • Là 1 phần của: Science, Nov 11, 2011, Vol.334(6057), p.792(3)
  • Mô tả: 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 (CsCI)-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. DOI: 10.1126/science.1208265
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0036-8075

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