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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
Source Normalized Impact per Paper (SNIP) 2018: 1.103

Online
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1945-3027
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Volume 93, Issue 2-3

Issues

New high-pressure B2 phase of FeS above 180 GPa

Nagayoshi Sata
  • Institute for Research on Earth Evolution, Japan Agency for Marin-Earth Science and Technology, 2-15 Natsushima cho, Yokosuka, Kanagawa 237-0061, Japan
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/ Hiroaki Ohfuji
  • Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
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/ Kei Hirose
  • Institute for Research on Earth Evolution, Japan Agency for Marin-Earth Science and Technology, 2-15 Natsushima cho, Yokosuka, Kanagawa 237-0061, Japan
  • Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
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/ Hisao Kobayashi
  • Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
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/ Yasuo Ohishi
  • Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
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/ Naohisa Hirao
  • Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
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Published Online: 2015-04-01 | DOI: https://doi.org/10.2138/am.2008.2762

Abstract

FeS exhibits extensive polymorphism at high pressure and temperature. All with NiAs-type (B8) or closely related structures. Here we report a new phase transition from FeS VI to CsCl-type (B2) phase (FeS VII) above 180 GPa based on the synchrotron X-ray diffraction (XRD) measurements. A significant volume reduction by 3.0% was observed at the phase transition, due to an increase in the coordination number from six to eight. Present results suggest that a substantial amount of sulfur may be incorporated into an Fe-Ni alloy with bcc structure in the Earth’s inner core.

Keywords: Earth’s core; troilite; high pressure; phase transformation; iron sulfide

About the article

Received: 2007-08-10

Accepted: 2007-10-11

Published Online: 2015-04-01

Published in Print: 2008-02-01


Citation Information: American Mineralogist, Volume 93, Issue 2-3, Pages 492–494, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2008.2762.

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© 2015 by Walter de Gruyter Berlin/Boston.Get Permission

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