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

S. Lundin, K. Catalli, J. Santillán, S. H. Shim, V. B. Prakapenka, M. Kunz, Y. Meng

Research output: Contribution to journalArticlepeer-review

87 Scopus citations


In order to investigate the effect of Fe on the equation of state (EOS), the volume of the perovskite (Pv) phases, (Mg1-xFex)SiO3, 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 (K0) 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 K0 = 250-264 GPa and K0 = 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.

Original languageEnglish (US)
Pages (from-to)97-102
Number of pages6
JournalPhysics of the Earth and Planetary Interiors
Issue number1-2
StatePublished - May 2008
Externally publishedYes


  • Equation of state
  • Mantle
  • Perovskite
  • Spin transition
  • X-ray diffraction

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science


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