skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Effect of Fe on the equation of state of mantle silicate perovskite over 1 Mbar

Abstract

In order to investigate the effect of Fe on the equation of state (EOS), the volume of the perovskite (Pv) phases, (Mg{sub 1-x}Fe{sub x})SiO{sub 3}, with different Fe contents (x=0, 0.09, 0.15), has been measured at high pressures up to 1 Mbar in an Ar or NaCl medium. A bulk modulus (K{sub 0}) ranging between 255 and 261 GPa is obtained when the Au scales consistent with the Pt scale are used and the data are fit to the second order Birch-Murnaghan (BM) equation. When the third order BM equation is used, we obtain K{sub 0} = 250-264 GPa and K{sub 0}' = 3.7-4.5, which is consistent with previous low-pressure X-ray diffraction and Brillouin measurements. Within experimental uncertainties (0.5% in volume and 6% in bulk modulus), we do not resolve differences in the EOS between Fe-bearing (up to 15%) and Fe-free Pv to 1 Mbar (2600-km depth in the mantle). This is in contrast with the much larger effect of the Fe spin transition for the EOS of ferropericlase (Fp) reported recently. This is perhaps due to much more diverse states of Fe (e.g., oxidation, coordination, and spin states) in Pv than in Fp.

Authors:
; ; ; ; ;  [1]
  1. MIT
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE
OSTI Identifier:
1006719
Resource Type:
Journal Article
Journal Name:
Phys. Earth Planet. In.
Additional Journal Information:
Journal Volume: 168; Journal Issue: (1-2) ; 05, 2008; Journal ID: ISSN 0031-9201
Country of Publication:
United States
Language:
ENGLISH
Subject:
58 GEOSCIENCES; EARTH MANTLE; EQUATIONS OF STATE; IRON; OXIDATION; PEROVSKITE; PEROVSKITES; SILICATES; SPIN; X-RAY DIFFRACTION

Citation Formats

Lundin, S, Catalli, K, Shim, S -H, Prakapenka, V B, Kunz, M, Meng, Y, CIW), UC), and LBNL). Effect of Fe on the equation of state of mantle silicate perovskite over 1 Mbar. United States: N. p., 2008. Web. doi:10.1016/j.pepi.2008.05.002.
Lundin, S, Catalli, K, Shim, S -H, Prakapenka, V B, Kunz, M, Meng, Y, CIW), UC), & LBNL). Effect of Fe on the equation of state of mantle silicate perovskite over 1 Mbar. United States. https://doi.org/10.1016/j.pepi.2008.05.002
Lundin, S, Catalli, K, Shim, S -H, Prakapenka, V B, Kunz, M, Meng, Y, CIW), UC), and LBNL). 2008. "Effect of Fe on the equation of state of mantle silicate perovskite over 1 Mbar". United States. https://doi.org/10.1016/j.pepi.2008.05.002.
@article{osti_1006719,
title = {Effect of Fe on the equation of state of mantle silicate perovskite over 1 Mbar},
author = {Lundin, S and Catalli, K and Shim, S -H and Prakapenka, V B and Kunz, M and Meng, Y and CIW) and UC) and LBNL)},
abstractNote = {In order to investigate the effect of Fe on the equation of state (EOS), the volume of the perovskite (Pv) phases, (Mg{sub 1-x}Fe{sub x})SiO{sub 3}, with different Fe contents (x=0, 0.09, 0.15), has been measured at high pressures up to 1 Mbar in an Ar or NaCl medium. A bulk modulus (K{sub 0}) ranging between 255 and 261 GPa is obtained when the Au scales consistent with the Pt scale are used and the data are fit to the second order Birch-Murnaghan (BM) equation. When the third order BM equation is used, we obtain K{sub 0} = 250-264 GPa and K{sub 0}' = 3.7-4.5, which is consistent with previous low-pressure X-ray diffraction and Brillouin measurements. Within experimental uncertainties (0.5% in volume and 6% in bulk modulus), we do not resolve differences in the EOS between Fe-bearing (up to 15%) and Fe-free Pv to 1 Mbar (2600-km depth in the mantle). This is in contrast with the much larger effect of the Fe spin transition for the EOS of ferropericlase (Fp) reported recently. This is perhaps due to much more diverse states of Fe (e.g., oxidation, coordination, and spin states) in Pv than in Fp.},
doi = {10.1016/j.pepi.2008.05.002},
url = {https://www.osti.gov/biblio/1006719}, journal = {Phys. Earth Planet. In.},
issn = {0031-9201},
number = (1-2) ; 05, 2008,
volume = 168,
place = {United States},
year = {Thu Jul 17 00:00:00 EDT 2008},
month = {Thu Jul 17 00:00:00 EDT 2008}
}