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Physics and Chemistry of Minerals

, Volume 45, Issue 6, pp 589–595 | Cite as

Measurements of sound velocity in iron–nickel alloys by femtosecond laser pulses in a diamond anvil cell

  • Tatsuya WakamatsuEmail author
  • Kenji OhtaEmail author
  • Takashi Yagi
  • Kei Hirose
  • Yasuo Ohishi
Original Paper

Abstract

By comparing the seismic wave velocity profile in the Earth with laboratory data of the sound velocity of iron alloys, we can infer the chemical composition of materials in the Earth’s core. The sound velocity of pure iron (Fe) has been sufficiently measured using various techniques, while experimental study on the sound velocity of iron–nickel (Fe–Ni) alloys is limited. Here, we measured longitudinal wave velocities of hexagonal-close-packed (hcp) structured Fe up to 29 GPa, Fe–5 wt% Ni, and Fe–15 wt% Ni up to 64 GPa via a combination of the femtosecond pulse laser pump–probe technique and a diamond anvil cell at room temperature condition. We found that the effect of Ni on the sound velocity of an Fe-based alloy is weaker than that determined by previous experimental study. In addition, we obtained the parameters of Birch’s law to be VP = 1146(57)ρ − 3638(567) for Fe–5 wt% Ni and VP = 1141(45)ρ− 3808(446) for Fe–15 wt% Ni, respectively, where VP is longitudinal wave velocity (m/s) and ρ is density (g/cm3).

Keywords

Earth’s core Sound velocity measurement High pressure Iron–nickel alloy Femtosecond pulse laser pump–probe technique Diamond anvil cell 

Notes

Acknowledgements

We thank Dr. Alexander F. Goncharov and Dr. Junichi Nakajima for their technical advice. Phase identification of our samples at high pressures was performed by means of synchrotron X-ray diffraction measurements at BL10XU, SPring-8 (proposal no. 2016B0080).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Earth and Planetary SciencesTokyo Institute of TechnologyTokyoJapan
  2. 2.National Metrology Institute of JapanNational Institute of Advanced Industrial Science and TechnologyIbarakiJapan
  3. 3.Earth-Life Science InstituteTokyo Institute of TechnologyTokyoJapan
  4. 4.Japan Synchrotron Radiation Research InstituteHyogoJapan

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