New high-pressure B2 phase of FeS above 180 GPa

Nagayoshi Sata; Hiroaki Ohfuji; Kei Hirose; Hisao Kobayashi; Yasuo Ohishi; Naohisa Hirao

doi:10.2138/am.2008.2762

New high-pressure B2 phase of FeS above 180 GPa

Nagayoshi Sata, Hiroaki Ohfuji, Kei Hirose, Hisao Kobayashi, Yasuo Ohishi, Naohisa Hirao

SCI - Earth Science

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

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.

Original language	English
Pages (from-to)	492-494
Number of pages	3
Journal	American Mineralogist
Volume	93
Issue number	2-3
DOIs	https://doi.org/10.2138/am.2008.2762
Publication status	Published - 2008

Keywords

Earth's core
High pressure
Iron sulfide
Phase transformation
Troilite

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10.2138/am.2008.2762

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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.",

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T1 - New high-pressure B2 phase of FeS above 180 GPa

AU - Sata, Nagayoshi

AU - Ohfuji, Hiroaki

AU - Hirose, Kei

AU - Kobayashi, Hisao

AU - Ohishi, Yasuo

AU - Hirao, Naohisa

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

KW - Earth's core

KW - High pressure

KW - Iron sulfide

KW - Phase transformation

KW - Troilite

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New high-pressure B2 phase of FeS above 180 GPa

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Keywords

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