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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2018: 2.631

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1945-3027
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Volume 101, Issue 6

Issues

High-pressure behavior of the polymorphs of FeOOH

Mary M. Reagan / Arianna E. Gleason / Luke Daemen / Yuming Xiao / Wendy L. Mao
  • Department of Geological Sciences, Stanford University, Stanford, California 94305, U.S.A
  • Photon Science, SLAC National Accelerator Laboratory, Menlo Park, California 94025, U.S.A
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2016-06-03 | DOI: https://doi.org/10.2138/am-2016-5449

Abstract

The high-pressure structural and electronic behavior of α-, β-, and g-FeOOH were studied in situ using a combination of synchrotron X ray diffraction (XRD) and X ray emission spectroscopy (XES). We monitored α-FeOOH by XES as a function of pressure up to 85 GPa and observed an electronic spin transition that began at approximately 50 GPa, which is consistent with previous results. In the γ-FeOOH sample, we see the initiation of a spin transition at 35 GPa that remains incomplete up to 65 GPa. β-FeOOH does not show any indication of a spin transition up to 65 GPa. Analysis of the high-pressure XRD data shows that neither β-FeOOH nor γ-FeOOH transform to new crystal structures, and both amorphize above 20 GPa. Comparing our EOS results for the b and g phases with recently published data on the a and e phases, we found that β-FeOOH exhibits distinct behavior from the other three polymorphs, as it is significantly less compressible and does not undergo a spin transition. A systematic examination of these iron hydroxide polymorphs as a function of pressure can provide insight into the relationship between electronic spin transitions and structural transitions in these OH- and Fe3+-bearing phases that may have implications on our understanding of the water content and oxidation state of the mantle.

Key words: Spin transitions; high-pressure studies; XES; FeOOH; XRD data

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About the article

Received: 2015-06-05

Accepted: 2016-02-16

Published Online: 2016-06-03

Published in Print: 2016-06-01


Citation Information: American Mineralogist, Volume 101, Issue 6, Pages 1483–1488, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2016-5449.

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© 2016 by Walter de Gruyter Berlin/Boston.

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