Electronic and magnetic structures of the postperovskite-type Fe{sub 2}O{sub 3} and implications for planetary magnetic records and deep interiors.

doi:https://doi.org/10.1073/pnas.0808549106

Title: Electronic and magnetic structures of the postperovskite-type Fe{sub 2}O{sub 3} and implications for planetary magnetic records and deep interiors.

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Abstract

Recent studies have shown that high pressure (P) induces the metallization of the Fe{sup 2+}-O bonding, the destruction of magnetic ordering in Fe, and the high-spin (HS) to low-spin (LS) transition of Fe in silicate and oxide phases at the deep planetary interiors. Hematite (Fe{sub 2}O{sub 3}) is an important magnetic carrier mineral for deciphering planetary magnetism and a proxy for Fe in the planetary interiors. Here, we present synchrotron Moessbauer spectroscopy and X-ray diffraction combined with ab initio calculations for Fe{sub 2}O{sub 3} revealing the destruction of magnetic ordering at the hematite {yields} Rh{sub 2}O{sub 3}-II type (RhII) transition at 70 GPa and 300 K, and then the revival of magnetic ordering at the RhII {yields} postperovskite (PPv) transition after laser heating at 73 GPa. At the latter transition, at least half of Fe{sup 3+} ions transform from LS to HS and Fe{sub 2}O{sub 3} changes from a semiconductor to a metal. This result demonstrates that some magnetic carrier minerals may experience a complex sequence of magnetic ordering changes during impact rather than a monotonic demagnetization. Also local Fe enrichment at Earth's core-mantle boundary will lead to changes in the electronic structure and spin state of Fe in silicatemore »« less

Authors:: Shim, S H; Bengtson, A; Morgan, D; Sturhahn, W; Catalli, K; Zhao, J; Lerche, M; Prakapenka, V

Publication Date:: 2009-04-07

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC); National Science Foundation (NSF)

OSTI Identifier:: 951902

Report Number(s):: ANL/XSD/JA-64151
Journal ID: ISSN 0027-8424; PNASA6; TRN: US0902339

DOE Contract Number:: DE-AC02-06CH11357

Resource Type:: Journal Article

Journal Name:: Proc. Natl. Acad. Sci. USA

Additional Journal Information:: Journal Volume: 106; Journal Issue: 14 ; Apr. 7, 2009; Journal ID: ISSN 0027-8424

Country of Publication:: United States

Language:: ENGLISH

Subject:: 43 PARTICLE ACCELERATORS; BONDING; DEMAGNETIZATION; ELECTRIC CONDUCTIVITY; ELECTRONIC STRUCTURE; HEATING; HEMATITE; LASERS; MAGNETISM; MOESSBAUER EFFECT; OXIDES; SILICATES; SPIN; SYNCHROTRONS; X-RAY DIFFRACTION

Citation Formats


                    Shim, S H, Bengtson, A, Morgan, D, Sturhahn, W, Catalli, K, Zhao, J, Lerche, M, Prakapenka, V, X-Ray Science Division, Massachusetts Inst. of Tech., Univ. of Wisconsin, Carnegie Institution of Washington, and Univ. of Chicago. Electronic and magnetic structures of the postperovskite-type Fe{sub 2}O{sub 3} and implications for planetary magnetic records and deep interiors..  United States: N. p., 2009. 
        Web.  doi:10.1073/pnas.0808549106.

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                    Shim, S H, Bengtson, A, Morgan, D, Sturhahn, W, Catalli, K, Zhao, J, Lerche, M, Prakapenka, V, X-Ray Science Division, Massachusetts Inst. of Tech., Univ. of Wisconsin, Carnegie Institution of Washington, & Univ. of Chicago. Electronic and magnetic structures of the postperovskite-type Fe{sub 2}O{sub 3} and implications for planetary magnetic records and deep interiors..  United States.  https://doi.org/10.1073/pnas.0808549106

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                    Shim, S H, Bengtson, A, Morgan, D, Sturhahn, W, Catalli, K, Zhao, J, Lerche, M, Prakapenka, V, X-Ray Science Division, Massachusetts Inst. of Tech., Univ. of Wisconsin, Carnegie Institution of Washington, and Univ. of Chicago. Tue .  
        "Electronic and magnetic structures of the postperovskite-type Fe{sub 2}O{sub 3} and implications for planetary magnetic records and deep interiors.".  United States.  https://doi.org/10.1073/pnas.0808549106.

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@article{osti_951902,

  title        = {Electronic and magnetic structures of the postperovskite-type Fe{sub 2}O{sub 3} and implications for planetary magnetic records and deep interiors.},

  author       = {Shim, S H and Bengtson, A and Morgan, D and Sturhahn, W and Catalli, K and Zhao, J and Lerche, M and Prakapenka, V and X-Ray Science Division and Massachusetts Inst. of Tech. and Univ. of Wisconsin and Carnegie Institution of Washington and Univ. of Chicago},

  abstractNote = {Recent studies have shown that high pressure (P) induces the metallization of the Fe{sup 2+}-O bonding, the destruction of magnetic ordering in Fe, and the high-spin (HS) to low-spin (LS) transition of Fe in silicate and oxide phases at the deep planetary interiors. Hematite (Fe{sub 2}O{sub 3}) is an important magnetic carrier mineral for deciphering planetary magnetism and a proxy for Fe in the planetary interiors. Here, we present synchrotron Moessbauer spectroscopy and X-ray diffraction combined with ab initio calculations for Fe{sub 2}O{sub 3} revealing the destruction of magnetic ordering at the hematite {yields} Rh{sub 2}O{sub 3}-II type (RhII) transition at 70 GPa and 300 K, and then the revival of magnetic ordering at the RhII {yields} postperovskite (PPv) transition after laser heating at 73 GPa. At the latter transition, at least half of Fe{sup 3+} ions transform from LS to HS and Fe{sub 2}O{sub 3} changes from a semiconductor to a metal. This result demonstrates that some magnetic carrier minerals may experience a complex sequence of magnetic ordering changes during impact rather than a monotonic demagnetization. Also local Fe enrichment at Earth's core-mantle boundary will lead to changes in the electronic structure and spin state of Fe in silicate PPv. If the ultra-low-velocity zones are composed of Fe-enriched silicate PPv and/or the basaltic materials are accumulated at the lowermost mantle, high electrical conductivity of these regions will play an important role for the electromagnetic coupling between the mantle and the core.},

  doi          = {10.1073/pnas.0808549106},

  url          = {https://www.osti.gov/biblio/951902},
  journal      = {Proc. Natl. Acad. Sci. USA},

  issn         = {0027-8424},

  number       = 14 ; Apr. 7, 2009,

  volume       = 106,

  place        = {United States},

  year         = {2009},

  month        = {4}

}

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