Phase transition boundary between B1 and B8 structures of FeO up to 210GPa

Haruka Ozawa; Kei Hirose; Shigehiko Tateno; Nagayoshi Sata; Yasuo Ohishi

doi:10.1016/j.pepi.2009.11.005

Phase transition boundary between B1 and B8 structures of FeO up to 210GPa

Haruka Ozawa, Kei Hirose, Shigehiko Tateno, Nagayoshi Sata, Yasuo Ohishi

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

60 Citations (Scopus)

Abstract

We have determined the phase transition boundary between NaCl-type (B1) and NiAs-type (B8) structures of FeO up to 208. GPa and 3800. K on the basis of synchrotron X-ray diffraction (XRD) measurements in situ at high pressure and temperature using a laser-heated diamond-anvil cell (DAC). The boundary is located at 200. GPa and 3200. K with positive Clapeyron slope. These results show that B1 phase of FeO is stable along the whole mantle geotherm, whereas B8 phase is stabilized at the inner core condition. Additionally, FeO coexisted with metallic Fe in the present experiments. We found that hexagonal close-packed (hcp) iron is stable over the entire present experimental conditions. Moreover, the direct chemical analyses of the recovered sample demonstrated that solid iron did not contain any detectable oxygen. While extensive solid solution between Fe and FeO has been speculated above 60-80. GPa, the present results strongly suggest that the system Fe-FeO is simple eutectic at least to 200. GPa pressure range.

Original language	English
Pages (from-to)	157-163
Number of pages	7
Journal	Physics of the Earth and Planetary Interiors
Volume	179
Issue number	3-4
DOIs	https://doi.org/10.1016/j.pepi.2009.11.005
Publication status	Published - Apr 2010

Keywords

B1 structure
B8 structure
DAC
Hcp-iron
Phase transition
X-ray diffraction

ASJC Scopus subject areas

Astronomy and Astrophysics
Geophysics
Physics and Astronomy (miscellaneous)
Space and Planetary Science

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10.1016/j.pepi.2009.11.005

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title = "Phase transition boundary between B1 and B8 structures of FeO up to 210GPa",

abstract = "We have determined the phase transition boundary between NaCl-type (B1) and NiAs-type (B8) structures of FeO up to 208. GPa and 3800. K on the basis of synchrotron X-ray diffraction (XRD) measurements in situ at high pressure and temperature using a laser-heated diamond-anvil cell (DAC). The boundary is located at 200. GPa and 3200. K with positive Clapeyron slope. These results show that B1 phase of FeO is stable along the whole mantle geotherm, whereas B8 phase is stabilized at the inner core condition. Additionally, FeO coexisted with metallic Fe in the present experiments. We found that hexagonal close-packed (hcp) iron is stable over the entire present experimental conditions. Moreover, the direct chemical analyses of the recovered sample demonstrated that solid iron did not contain any detectable oxygen. While extensive solid solution between Fe and FeO has been speculated above 60-80. GPa, the present results strongly suggest that the system Fe-FeO is simple eutectic at least to 200. GPa pressure range.",

keywords = "B1 structure, B8 structure, DAC, Hcp-iron, Phase transition, X-ray diffraction",

author = "Haruka Ozawa and Kei Hirose and Shigehiko Tateno and Nagayoshi Sata and Yasuo Ohishi",

note = "Funding Information: The manuscript was improved by comments from two anonymous reviewers. We thank D.C. Rubie for editorial handling. E. Sugimura kindly corrected the English of the manuscript. X-ray diffraction measurements were conducted at SPring-8 (proposal no. 2008A0099). HO was supported by the 21st century COE program. Copyright: Copyright 2010 Elsevier B.V., All rights reserved.",

year = "2010",

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doi = "10.1016/j.pepi.2009.11.005",

language = "English",

volume = "179",

pages = "157--163",

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T1 - Phase transition boundary between B1 and B8 structures of FeO up to 210GPa

AU - Ozawa, Haruka

AU - Hirose, Kei

AU - Tateno, Shigehiko

AU - Sata, Nagayoshi

AU - Ohishi, Yasuo

N1 - Funding Information: The manuscript was improved by comments from two anonymous reviewers. We thank D.C. Rubie for editorial handling. E. Sugimura kindly corrected the English of the manuscript. X-ray diffraction measurements were conducted at SPring-8 (proposal no. 2008A0099). HO was supported by the 21st century COE program. Copyright: Copyright 2010 Elsevier B.V., All rights reserved.

PY - 2010/4

Y1 - 2010/4

N2 - We have determined the phase transition boundary between NaCl-type (B1) and NiAs-type (B8) structures of FeO up to 208. GPa and 3800. K on the basis of synchrotron X-ray diffraction (XRD) measurements in situ at high pressure and temperature using a laser-heated diamond-anvil cell (DAC). The boundary is located at 200. GPa and 3200. K with positive Clapeyron slope. These results show that B1 phase of FeO is stable along the whole mantle geotherm, whereas B8 phase is stabilized at the inner core condition. Additionally, FeO coexisted with metallic Fe in the present experiments. We found that hexagonal close-packed (hcp) iron is stable over the entire present experimental conditions. Moreover, the direct chemical analyses of the recovered sample demonstrated that solid iron did not contain any detectable oxygen. While extensive solid solution between Fe and FeO has been speculated above 60-80. GPa, the present results strongly suggest that the system Fe-FeO is simple eutectic at least to 200. GPa pressure range.

AB - We have determined the phase transition boundary between NaCl-type (B1) and NiAs-type (B8) structures of FeO up to 208. GPa and 3800. K on the basis of synchrotron X-ray diffraction (XRD) measurements in situ at high pressure and temperature using a laser-heated diamond-anvil cell (DAC). The boundary is located at 200. GPa and 3200. K with positive Clapeyron slope. These results show that B1 phase of FeO is stable along the whole mantle geotherm, whereas B8 phase is stabilized at the inner core condition. Additionally, FeO coexisted with metallic Fe in the present experiments. We found that hexagonal close-packed (hcp) iron is stable over the entire present experimental conditions. Moreover, the direct chemical analyses of the recovered sample demonstrated that solid iron did not contain any detectable oxygen. While extensive solid solution between Fe and FeO has been speculated above 60-80. GPa, the present results strongly suggest that the system Fe-FeO is simple eutectic at least to 200. GPa pressure range.

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KW - Phase transition

KW - X-ray diffraction

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Phase transition boundary between B1 and B8 structures of FeO up to 210GPa

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