Constraints on Earth’s inner core composition inferred from measurements of the sound velocity of hcp-iron in extreme conditions

Tatsuya Sakamaki; Eiji Ohtani; Hiroshi Fukui; Seiji Kamada; Suguru Takahashi; Takanori Sakairi; Akihiro Takahata; Takeshi Sakai; Satoshi Tsutsui; Daisuke Ishikawa; Rei Shiraishi; Yusuke Seto; Taku Tsuchiya; Alfred Q. R. Baron

doi:10.1126/sciadv.1500802

Research ArticleGEOPHYSICS

Constraints on Earth’s inner core composition inferred from measurements of the sound velocity of hcp-iron in extreme conditions

Tatsuya Sakamaki¹,*,
Eiji Ohtani¹,²,
Hiroshi Fukui³,⁴,
Seiji Kamada¹,⁵,
Suguru Takahashi¹,
Takanori Sakairi¹,
Akihiro Takahata¹,
Takeshi Sakai⁶,
Satoshi Tsutsui⁷,
Daisuke Ishikawa⁷,
Rei Shiraishi¹,
Yusuke Seto⁸,
Taku Tsuchiya⁶ and
Alfred Q. R. Baron⁴,⁷

¹Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan.
²V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia.
³Center for Novel Material Science under Multi-Extreme Conditions, Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan.
⁴Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.
⁵Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai Miyagi 980-8578, Japan.
⁶Geodynamics Research Center, Ehime University, Matsuyama, Ehime 790-8577, Japan.
⁷Research and Utilization Division, Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.
⁸Department of Earth and Planetary Sciences, Kobe University, Kobe 657-8501, Japan.

↵*Corresponding author. E-mail: sakamaki{at}m.tohoku.ac.jp

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Science Advances 26 Feb 2016:
Vol. 2, no. 2, e1500802
DOI: 10.1126/sciadv.1500802

Tatsuya Sakamaki

Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan.

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For correspondence: sakamaki@m.tohoku.ac.jp

Eiji Ohtani

Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan.

V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia.

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Hiroshi Fukui

Center for Novel Material Science under Multi-Extreme Conditions, Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan.

Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.

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ORCID record for Hiroshi Fukui

Seiji Kamada

Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan.

Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai Miyagi 980-8578, Japan.

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Suguru Takahashi

Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan.

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Takanori Sakairi

Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan.

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Akihiro Takahata

Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan.

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Takeshi Sakai

Geodynamics Research Center, Ehime University, Matsuyama, Ehime 790-8577, Japan.

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Satoshi Tsutsui

Research and Utilization Division, Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.

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Daisuke Ishikawa

Research and Utilization Division, Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.

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Rei Shiraishi

Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan.

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Yusuke Seto

Department of Earth and Planetary Sciences, Kobe University, Kobe 657-8501, Japan.

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Taku Tsuchiya

Geodynamics Research Center, Ehime University, Matsuyama, Ehime 790-8577, Japan.

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Alfred Q. R. Baron

Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.

Research and Utilization Division, Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan.

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Constraints on Earth’s inner core composition inferred from measurements of the sound velocity of hcp-iron in extreme conditions

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