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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
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1945-3027
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Volume 96, Issue 10

Issues

Phase stability and compression study of (Fe0.89,Ni0.11)3S up to pressure of the Earth’s core

Takeshi Sakai
  • Corresponding author
  • International Advanced Research and Education Organization, Tohoku University, Sendai 980-8578, Japan
  • Department of Earth and Planetary Materials Science, Tohoku University, Sendai 980-8578, Japan
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/ Eiji Ohtani
  • Department of Earth and Planetary Materials Science, Tohoku University, Sendai 980-8578, Japan
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/ Hidenori Terasaki
  • Department of Earth and Planetary Materials Science, Tohoku University, Sendai 980-8578, Japan
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/ Seiji Kamada
  • Department of Earth and Planetary Materials Science, Tohoku University, Sendai 980-8578, Japan
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/ Naohisa Hirao / Masaaki Miyahara
  • Department of Earth and Planetary Materials Science, Tohoku University, Sendai 980-8578, Japan
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/ Masahiko Nishijima
Published Online: 2015-04-02 | DOI: https://doi.org/10.2138/am.2011.3822

Abstract

An in situ synchrotron powder X‑ray diffraction study on (Fe0.89,Ni0.11)3S was conducted up to 141 GPa and 1590 K. (Fe0.89,Ni0.11)3S has a tetragonal structure, which is the same structure as Ni-free Fe3S. Fitting a third-order Birch-Murnaghan equation of state to data at ambient temperature yielded a bulk modulus of K0 = 138.1(7.2) GPa and its pressure derivative K0′ = 4.5(3) with a zero pressure volume V0 = 375.67(4) Å3. The density of (Fe0.89,Ni0.11)3S under the core-mantle boundary condition is 1.7% greater than that of Fe3S. The axial ratio (c/a) of (Fe0.89,Ni0.11)3S decreases with increasing pressure. The addition of nickel to Fe3S leads to a softening of the c-axis. Assuming that the nickel content of the outer core is about 5 at%, we estimated 12.3-20.8 at% sulfur in the outer core for the given 6-10% density deficit between the outer core and pure iron at 136 GPa.

Keywords : Earth’s core; core-mantle boundary; Fe-FeS system; phase relation; equation of state; laser-heated diamond-anvil cell

About the article

Received: 2011-03-02

Accepted: 2011-06-14

Published Online: 2015-04-02

Published in Print: 2011-10-01


Citation Information: American Mineralogist, Volume 96, Issue 10, Pages 1490–1494, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2011.3822.

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