Solubility of FeO in (Mg,Fe)SiO3 perovskite and the post-perovskite phase transition

Shigehiko Tateno; Kei Hirose; Nagayoshi Sata; Yasuo Ohishi

doi:10.1016/j.pepi.2006.11.010

Solubility of FeO in (Mg,Fe)SiO₃ perovskite and the post-perovskite phase transition

Shigehiko Tateno, Kei Hirose, Nagayoshi Sata, Yasuo Ohishi

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

72 Citations (Scopus)

Abstract

Phase relations in Mg_0.5Fe_0.5SiO₃ and Mg_0.25Fe_0.75SiO₃ were investigated in a pressure range from 72 to 123 GPa on the basis of synchrotron X-ray diffraction measurements in situ at high-pressure and -temperature in a laser-heated diamond-anvil cell (LHDAC). Results demonstrate that Mg_0.5Fe_0.5SiO₃ perovskite is formed as a single phase at 85-108 GPa and 1800-2330 K, indicating a high solubility of FeO in (Mg,Fe)SiO₃ perovskite at high pressures. Post-perovskite appears coexisting with perovskite in Mg_0.5Fe_0.5SiO₃ above 106 GPa at 1410 K, the condition very close to the post-perovskite phase transition boundary in pure MgSiO₃. The coexistence of perovskite and post-perovskite was observed to 123 GPa. In addition, post-perovskite was formed coexisting with perovskite also in Mg_0.25Fe_0.75SiO₃ bulk composition at 106-123 GPa. In contrast to earlier experimental and theoretical studies, these results show that incorporation of FeO stabilizes perovskite at higher pressures. This could be due to a larger ionic radius of Fe²⁺ ion, which is incompatible with a small Mg²⁺ site in the post-perovskite phase.

Original language	English
Pages (from-to)	319-325
Number of pages	7
Journal	Physics of the Earth and Planetary Interiors
Volume	160
Issue number	3-5
DOIs	https://doi.org/10.1016/j.pepi.2006.11.010
Publication status	Published - Mar 16 2007

Keywords

D″ layer
In situ X-ray observation
Iron
Perovskite
Phase transition
Post-perovskite

ASJC Scopus subject areas

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

Access to Document

10.1016/j.pepi.2006.11.010

Cite this

@article{5401252d0fc04c2391f6db5a9a31cdde,

title = "Solubility of FeO in (Mg,Fe)SiO3 perovskite and the post-perovskite phase transition",

abstract = "Phase relations in Mg0.5Fe0.5SiO3 and Mg0.25Fe0.75SiO3 were investigated in a pressure range from 72 to 123 GPa on the basis of synchrotron X-ray diffraction measurements in situ at high-pressure and -temperature in a laser-heated diamond-anvil cell (LHDAC). Results demonstrate that Mg0.5Fe0.5SiO3 perovskite is formed as a single phase at 85-108 GPa and 1800-2330 K, indicating a high solubility of FeO in (Mg,Fe)SiO3 perovskite at high pressures. Post-perovskite appears coexisting with perovskite in Mg0.5Fe0.5SiO3 above 106 GPa at 1410 K, the condition very close to the post-perovskite phase transition boundary in pure MgSiO3. The coexistence of perovskite and post-perovskite was observed to 123 GPa. In addition, post-perovskite was formed coexisting with perovskite also in Mg0.25Fe0.75SiO3 bulk composition at 106-123 GPa. In contrast to earlier experimental and theoretical studies, these results show that incorporation of FeO stabilizes perovskite at higher pressures. This could be due to a larger ionic radius of Fe2+ ion, which is incompatible with a small Mg2+ site in the post-perovskite phase.",

keywords = "D″ layer, In situ X-ray observation, Iron, Perovskite, Phase transition, Post-perovskite",

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

note = "Funding Information: X-ray diffraction measurements were conducted at SPring-8 (proposal no. 2005B6892-PUl-np, 2005B0010-LD2-np and 2006A0099). Comments by T. Tsuchiya on ab initio calculations were helpful. E. Takahashi and E. Sugimura are acknowledged for sample preparation. We also thank T. Komabayashi and M. Murakami for discussion throughout this study. Three anonymous reviewers{\textquoteright} comments improved the manuscript. S.T. is supported by the Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists.",

year = "2007",

month = mar,

day = "16",

doi = "10.1016/j.pepi.2006.11.010",

language = "English",

volume = "160",

pages = "319--325",

journal = "Physics of the Earth and Planetary Interiors",

issn = "0031-9201",

publisher = "Elsevier",

number = "3-5",

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TY - JOUR

T1 - Solubility of FeO in (Mg,Fe)SiO3 perovskite and the post-perovskite phase transition

AU - Tateno, Shigehiko

AU - Hirose, Kei

AU - Sata, Nagayoshi

AU - Ohishi, Yasuo

N1 - Funding Information: X-ray diffraction measurements were conducted at SPring-8 (proposal no. 2005B6892-PUl-np, 2005B0010-LD2-np and 2006A0099). Comments by T. Tsuchiya on ab initio calculations were helpful. E. Takahashi and E. Sugimura are acknowledged for sample preparation. We also thank T. Komabayashi and M. Murakami for discussion throughout this study. Three anonymous reviewers’ comments improved the manuscript. S.T. is supported by the Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists.

PY - 2007/3/16

Y1 - 2007/3/16

N2 - Phase relations in Mg0.5Fe0.5SiO3 and Mg0.25Fe0.75SiO3 were investigated in a pressure range from 72 to 123 GPa on the basis of synchrotron X-ray diffraction measurements in situ at high-pressure and -temperature in a laser-heated diamond-anvil cell (LHDAC). Results demonstrate that Mg0.5Fe0.5SiO3 perovskite is formed as a single phase at 85-108 GPa and 1800-2330 K, indicating a high solubility of FeO in (Mg,Fe)SiO3 perovskite at high pressures. Post-perovskite appears coexisting with perovskite in Mg0.5Fe0.5SiO3 above 106 GPa at 1410 K, the condition very close to the post-perovskite phase transition boundary in pure MgSiO3. The coexistence of perovskite and post-perovskite was observed to 123 GPa. In addition, post-perovskite was formed coexisting with perovskite also in Mg0.25Fe0.75SiO3 bulk composition at 106-123 GPa. In contrast to earlier experimental and theoretical studies, these results show that incorporation of FeO stabilizes perovskite at higher pressures. This could be due to a larger ionic radius of Fe2+ ion, which is incompatible with a small Mg2+ site in the post-perovskite phase.

AB - Phase relations in Mg0.5Fe0.5SiO3 and Mg0.25Fe0.75SiO3 were investigated in a pressure range from 72 to 123 GPa on the basis of synchrotron X-ray diffraction measurements in situ at high-pressure and -temperature in a laser-heated diamond-anvil cell (LHDAC). Results demonstrate that Mg0.5Fe0.5SiO3 perovskite is formed as a single phase at 85-108 GPa and 1800-2330 K, indicating a high solubility of FeO in (Mg,Fe)SiO3 perovskite at high pressures. Post-perovskite appears coexisting with perovskite in Mg0.5Fe0.5SiO3 above 106 GPa at 1410 K, the condition very close to the post-perovskite phase transition boundary in pure MgSiO3. The coexistence of perovskite and post-perovskite was observed to 123 GPa. In addition, post-perovskite was formed coexisting with perovskite also in Mg0.25Fe0.75SiO3 bulk composition at 106-123 GPa. In contrast to earlier experimental and theoretical studies, these results show that incorporation of FeO stabilizes perovskite at higher pressures. This could be due to a larger ionic radius of Fe2+ ion, which is incompatible with a small Mg2+ site in the post-perovskite phase.

KW - D″ layer

KW - In situ X-ray observation

KW - Iron

KW - Perovskite

KW - Phase transition

KW - Post-perovskite

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U2 - 10.1016/j.pepi.2006.11.010

DO - 10.1016/j.pepi.2006.11.010

M3 - Article

AN - SCOPUS:33846615882

SN - 0031-9201

VL - 160

SP - 319

EP - 325

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

IS - 3-5

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