Spin state of ferric iron in MgSiO3 perovskite and its effect on elastic properties

Krystle Catalli, Sang-Heon Shim, Vitali B. Prakapenka, Jiyong Zhao, Wolfgang Sturhahn, Paul Chow, Yuming Xiao, Haozhe Liu, Hyunchae Cynn, William J. Evans

Research output: Contribution to journalArticle

102 Citations (Scopus)

Abstract

Recent studies have indicated that a significant amount of iron in MgSiO3 perovskite (Pv) is Fe3+ (Fe3+/ΣFe = 10-60%) due to crystal chemistry effects at high pressure (P) and that Fe3+ is more likely than Fe2+ to undergo a high-spin (HS) to low-spin (LS) transition in Pv in the mantle. We have measured synchrotron Mössbauer spectroscopy (SMS), X-ray emission spectroscopy (XES), and X-ray diffraction (XRD) of Pv with all iron in Fe3+ in the laser-heated diamond-anvil cell to over 100 GPa. Fe3+ increases the anisotropy of the Pv unit cell, whereas Fe2+ decreases it. In Pv synthesized above 50 GPa, Fe3+ enters into both the dodecahedral (A) and octahedral (B) sites approximately equally, suggesting charge coupled substitution. Combining SMS and XES, we found that the LS population in the B site gradually increases with pressure up to 50-60 GPa where all Fe3+ in the B site becomes LS, while Fe3+ in the A site remains HS to at least 136 GPa. Fe3+ makes Pv more compressible than Mg-endmember below 50 GPa because of the gradual spin transition in the B site together with lattice compression. The completion of the spin transition at 50-60 GPa increases bulk modulus with no associated change in density. This elasticity change can be a useful seismic probe for investigating compositional heterogeneities associated with Fe3+.

Original languageEnglish (US)
Pages (from-to)68-75
Number of pages8
JournalEarth and Planetary Science Letters
Volume289
Issue number1-2
DOIs
StatePublished - Jan 15 2010
Externally publishedYes

Fingerprint

elastic property
perovskite
Iron
elastic properties
iron
spectroscopy
Synchrotrons
synchrotrons
Crystal chemistry
diamond anvil cell
Diamond
crystal chemistry
bulk modulus
x rays
X-ray spectroscopy
elasticity
anvils
effect
cells
Elasticity

Keywords

  • elastic properties
  • ferric iron
  • lower mantle
  • silicate perovskite
  • spin transition

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Spin state of ferric iron in MgSiO3 perovskite and its effect on elastic properties. / Catalli, Krystle; Shim, Sang-Heon; Prakapenka, Vitali B.; Zhao, Jiyong; Sturhahn, Wolfgang; Chow, Paul; Xiao, Yuming; Liu, Haozhe; Cynn, Hyunchae; Evans, William J.

In: Earth and Planetary Science Letters, Vol. 289, No. 1-2, 15.01.2010, p. 68-75.

Research output: Contribution to journalArticle

Catalli, K, Shim, S-H, Prakapenka, VB, Zhao, J, Sturhahn, W, Chow, P, Xiao, Y, Liu, H, Cynn, H & Evans, WJ 2010, 'Spin state of ferric iron in MgSiO3 perovskite and its effect on elastic properties', Earth and Planetary Science Letters, vol. 289, no. 1-2, pp. 68-75. https://doi.org/10.1016/j.epsl.2009.10.029
Catalli, Krystle ; Shim, Sang-Heon ; Prakapenka, Vitali B. ; Zhao, Jiyong ; Sturhahn, Wolfgang ; Chow, Paul ; Xiao, Yuming ; Liu, Haozhe ; Cynn, Hyunchae ; Evans, William J. / Spin state of ferric iron in MgSiO3 perovskite and its effect on elastic properties. In: Earth and Planetary Science Letters. 2010 ; Vol. 289, No. 1-2. pp. 68-75.
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AU - Shim, Sang-Heon

AU - Prakapenka, Vitali B.

AU - Zhao, Jiyong

AU - Sturhahn, Wolfgang

AU - Chow, Paul

AU - Xiao, Yuming

AU - Liu, Haozhe

AU - Cynn, Hyunchae

AU - Evans, William J.

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