Sound velocity and elastic properties of Fe–Ni and Fe–Ni–C liquids at high pressure

Soma Kuwabara, Hidenori Terasaki, Keisuke Nishida, Yuta Shimoyama, Yusaku Takubo, Yuji Higo, Yuki Shibazaki, Satoru Urakawa, Kentaro Uesugi, Akihisa Takeuchi, Tadashi Kondo

Research output: Contribution to journalArticle

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Abstract

The sound velocity (VP) of liquid Fe–10 wt% Ni and Fe–10 wt% Ni–4 wt% C up to 6.6 GPa was studied using the ultrasonic pulse-echo method combined with synchrotron X-ray techniques. The obtained VP of liquid Fe–Ni is insensitive to temperature, whereas that of liquid Fe–Ni–C tends to decrease with increasing temperature. The VP values of both liquid Fe–Ni and Fe–Ni–C increase with pressure. Alloying with 10 wt% of Ni slightly reduces the VP of liquid Fe, whereas alloying with C is likely to increase the VP. However, a difference in VP between liquid Fe–Ni and Fe–Ni–C becomes to be smaller at higher temperature. By fitting the measured VP data with the Murnaghan equation of state, the adiabatic bulk modulus (KS0) and its pressure derivative (KS ) were obtained to be KS0 = 103 GPa and KS  = 5.7 for liquid Fe–Ni and KS0 = 110 GPa and KS  = 7.6 for liquid Fe–Ni–C. The calculated density of liquid Fe–Ni–C using the obtained elastic parameters was consistent with the density values measured directly using the X-ray computed tomography technique. In the relation between the density (ρ) and sound velocity (VP) at 5 GPa (the lunar core condition), it was found that the effect of alloying Fe with Ni was that ρ increased mildly and VP decreased, whereas the effect of C dissolution was to decrease ρ but increase VP. In contrast, alloying with S significantly reduces both ρ and VP. Therefore, the effects of light elements (C and S) and Ni on the ρ and VP of liquid Fe are quite different under the lunar core conditions, providing a clue to constrain the light element in the lunar core by comparing with lunar seismic data.

Original languageEnglish
Pages (from-to)229-236
Number of pages8
JournalPhysics and Chemistry of Minerals
Volume43
Issue number3
DOIs
Publication statusPublished - Mar 1 2016

Fingerprint

sound velocity
elastic property
Acoustic wave velocity
liquid
Liquids
Alloying
X rays
Density of liquids
bulk modulus
Synchrotrons
Equations of state
Temperature
Tomography
equation of state
Dissolution
tomography
Elastic moduli
Ultrasonics
seismic data
temperature

Keywords

  • Density
  • Fe-alloy
  • High pressure
  • Liquid
  • Sound velocity

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Materials Science(all)

Cite this

Kuwabara, S., Terasaki, H., Nishida, K., Shimoyama, Y., Takubo, Y., Higo, Y., ... Kondo, T. (2016). Sound velocity and elastic properties of Fe–Ni and Fe–Ni–C liquids at high pressure. Physics and Chemistry of Minerals, 43(3), 229-236. https://doi.org/10.1007/s00269-015-0789-y

Sound velocity and elastic properties of Fe–Ni and Fe–Ni–C liquids at high pressure. / Kuwabara, Soma; Terasaki, Hidenori; Nishida, Keisuke; Shimoyama, Yuta; Takubo, Yusaku; Higo, Yuji; Shibazaki, Yuki; Urakawa, Satoru; Uesugi, Kentaro; Takeuchi, Akihisa; Kondo, Tadashi.

In: Physics and Chemistry of Minerals, Vol. 43, No. 3, 01.03.2016, p. 229-236.

Research output: Contribution to journalArticle

Kuwabara, S, Terasaki, H, Nishida, K, Shimoyama, Y, Takubo, Y, Higo, Y, Shibazaki, Y, Urakawa, S, Uesugi, K, Takeuchi, A & Kondo, T 2016, 'Sound velocity and elastic properties of Fe–Ni and Fe–Ni–C liquids at high pressure', Physics and Chemistry of Minerals, vol. 43, no. 3, pp. 229-236. https://doi.org/10.1007/s00269-015-0789-y
Kuwabara, Soma ; Terasaki, Hidenori ; Nishida, Keisuke ; Shimoyama, Yuta ; Takubo, Yusaku ; Higo, Yuji ; Shibazaki, Yuki ; Urakawa, Satoru ; Uesugi, Kentaro ; Takeuchi, Akihisa ; Kondo, Tadashi. / Sound velocity and elastic properties of Fe–Ni and Fe–Ni–C liquids at high pressure. In: Physics and Chemistry of Minerals. 2016 ; Vol. 43, No. 3. pp. 229-236.
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