The spin state of iron in minerals of Earth's lower mantle

doi:10.1029/2005GL022802

Title: The spin state of iron in minerals of Earth's lower mantle

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Abstract

Here, the spin state of Fe(II) and Fe(III) at temperatures and pressures typical for the Earth's lower mantle is discussed. We predict an extended high-spin to low-spin crossover region along the geotherm for Fe-dilute systems depending on crystal-field splitting, pairing energy, and cooperative interactions. In particular, spin transitions in ferromagnesium silicate perovskite and ferropericlase, the dominant lower mantle components, should occur in a wide temperature-pressure range. We also derive a gradual volume change associated with such transitions in the lower mantle. The gradual density changes and the wide spin crossover regions seem incompatible with lower mantle stratification resulting from a spin transition.

Authors:

Sturhahn, Wolfgang ^[1]; Jackson, Jennifer M. ^[2]; Lin, Jung -Fu ^[3]

Argonne National Lab. (ANL), Lemont, IL (United States)
Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Carnegie Institution of Washington, Washington, DC (United States)

Publication Date:: 2005-06-23

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Org.:: USDOE

OSTI Identifier:: 898678

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Geophysical Research Letters

Additional Journal Information:: Journal Volume: 32; Journal Issue: 12; Journal ID: ISSN 0094-8276

Publisher:: American Geophysical Union

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; IRON; SPIN; EARTH MANTLE; MINERALS; advanced photon source

Citation Formats


                    Sturhahn, Wolfgang, Jackson, Jennifer M., and Lin, Jung -Fu. The spin state of iron in minerals of Earth's lower mantle.  United States: N. p., 2005. 
        Web.  doi:10.1029/2005GL022802.

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                    Sturhahn, Wolfgang, Jackson, Jennifer M., & Lin, Jung -Fu. The spin state of iron in minerals of Earth's lower mantle.  United States.  doi:10.1029/2005GL022802.

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                    Sturhahn, Wolfgang, Jackson, Jennifer M., and Lin, Jung -Fu. Thu .  
        "The spin state of iron in minerals of Earth's lower mantle".  United States.  doi:10.1029/2005GL022802.  https://www.osti.gov/servlets/purl/898678.

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@article{osti_898678,

  title        = {The spin state of iron in minerals of Earth's lower mantle},

  author       = {Sturhahn, Wolfgang and Jackson, Jennifer M. and Lin, Jung -Fu},

  abstractNote = {Here, the spin state of Fe(II) and Fe(III) at temperatures and pressures typical for the Earth's lower mantle is discussed. We predict an extended high-spin to low-spin crossover region along the geotherm for Fe-dilute systems depending on crystal-field splitting, pairing energy, and cooperative interactions. In particular, spin transitions in ferromagnesium silicate perovskite and ferropericlase, the dominant lower mantle components, should occur in a wide temperature-pressure range. We also derive a gradual volume change associated with such transitions in the lower mantle. The gradual density changes and the wide spin crossover regions seem incompatible with lower mantle stratification resulting from a spin transition.},

  doi          = {10.1029/2005GL022802},

  journal      = {Geophysical Research Letters},

  number       = 12,

  volume       = 32,

  place        = {United States},

  year         = {2005},

  month        = {6}

}

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DOI: 10.1029/2005GL022802

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