Startseite Sound wave velocities of Fe5Si at high-pressure and high-temperature conditions: Implications to lunar and planetary cores
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Sound wave velocities of Fe5Si at high-pressure and high-temperature conditions: Implications to lunar and planetary cores

  • Liwei Deng EMAIL logo , Yoshio Kono und Guoyin Shen
Veröffentlicht/Copyright: 23. Januar 2019
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 104 Heft 2

Abstract

Elastic properties of Fe alloys are critical in constraining the compositions of planetary bodies by comparing to the planetary observations. The sound wave velocities and density of an Fe5Si (9 wt% Si) alloy in body-centered cubic (bcc) structure were measured by combining an ultrasonic technique with synchrotron X‑ray radiography at pressure (P) and temperature (T) conditions of 2.6–7.5 GPa and 300–1173 K, respectively. At room temperature, it is observed that adding Si to bcc-Fe increases the compressional wave velocity (vP) but decreases the shear wave velocity (vS). At high temperatures, we observed a pronounced effect of pressure on the vS-T relations in the Fe5Si alloy. The vP-density (ρ) relationship of the Fe5Si alloy is found to follow the Birch’s law in the P-T range of this study, whereas the vS-ρ relation exhibits complex behavior. Implications of these results to the lunar core and the Mercurian core are discussed. Our results imply that adding Si to a pure Fe lunar core would be invisible in terms of vP, but exhibit a decreased vS. Including Si in a sulfur-rich lunar core would display an increased vP and a decreased ρ. Our density and sound wave velocity model provide lower and upper limit for a Si-bearing lunar core if 1–3 wt% Si content of enstatite chondrite is taken as compositional analog. A Si-rich (>9 wt%) Mercurian core model is derived to satisfy newly observed moment of inertia values by Messenger spacecraft.

Keywords: Fe-Si alloy; elastic wave velocity; lunar and planetary cores; high pressure; high temperature

  1. Funding This work was supported by the Major Program of National Natural Science Foundation of China (41490632), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB18000000), and the National Natural Science Foundation of China (41374096, 41174071). This work was performed at HPCAT (Sector 16), Advanced Photon Source (APS), Argonne National Labora-tory. G.S. and Y.K. acknowledge the support by DOE-BES, Division of Materials Sciences and Engineering under Award No. DEFG02-99ER45775. HPCAT operation is supported by DOE-NNSA under Award No. DE-NA0001974, with partial instrumentation funding by NSF. The Advanced Photon Source is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Sci-ence by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

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Received: 2018-03-23
Accepted: 2018-11-02
Published Online: 2019-01-23
Published in Print: 2019-02-25

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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  11. Elasticity of single-crystal periclase at high pressure and temperature: The effect of iron on the elasticity and seismic parameters of ferropericlase in the lower mantle
  12. Elastic plastic self-consistent (EPSC) modeling of San Carlos olivine deformed in a D-DIA apparatus
  13. Kinetics of antigorite dehydration: Rapid dehydration as a trigger for lower-plane seismicity in subduction zones
  14. Sound wave velocities of Fe5Si at high-pressure and high-temperature conditions: Implications to lunar and planetary cores
  15. Evidence for syngenetic micro-inclusions of As3+- and As5+-containing Cu sulfides in hydrothermal pyrite
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https://doi.org/10.2138/am-2019-6564
Schlagwörter für diesen Artikel
Fe-Si alloy; elastic wave velocity; lunar and planetary cores; high pressure; high temperature

Artikel in diesem Heft

  1. Special collection: Planetary processes as revealed by sulfides and chalcophile elements
  2. Dating mantle peridotites using Re-Os isotopes: The complex message from whole rocks, base metal sulfides, and platinum group minerals
  3. In situ measurements of lead and other trace elements in abyssal peridotite sulfides
  4. Special collection: Volatile elements in differentiated planetary interiors
  5. A terrestrial magmatic hibonite-grossite-vanadium assemblage: Desilication and extreme reduction in a volcanic plumbing system, Mount Carmel, Israel
  6. Special collection: Understanding of reaction and deformation microstructures
  7. Intragranular plasticity vs. grain boundary sliding (GBS) in forsterite: Microstructural evidence at high pressures (3.5–5.0 GPa)
  8. Articles
  9. Excess functions of chlorite solid solutions and neoformation of Fe-chlorites: Some implications of recent thermochemical measurements
  10. Nanoscale study of lamellar exsolutions in clinopyroxene from olivine gabbro: Recording crystallization sequences in iron-rich layered intrusions
  11. Elasticity of single-crystal periclase at high pressure and temperature: The effect of iron on the elasticity and seismic parameters of ferropericlase in the lower mantle
  12. Elastic plastic self-consistent (EPSC) modeling of San Carlos olivine deformed in a D-DIA apparatus
  13. Kinetics of antigorite dehydration: Rapid dehydration as a trigger for lower-plane seismicity in subduction zones
  14. Sound wave velocities of Fe5Si at high-pressure and high-temperature conditions: Implications to lunar and planetary cores
  15. Evidence for syngenetic micro-inclusions of As3+- and As5+-containing Cu sulfides in hydrothermal pyrite
  16. The oxidation state of sulfur in lunar apatite
  17. Reviewers 2018
  18. American Mineralogist thanks the 2018 reviewers
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