Pressure-induced electronic spin transition of iron in magnesiowustite-(Mg,Fe)O

Jung-Fu Lin, Alexander G. Gavriliuk, Viktor V. Struzhkin, Steven D. Jacobsen, Wolfgang Sturhahn, Michael Y. Hu, Paul Chow, and Choong-Shik Yoo
Phys. Rev. B 73, 113107 – Published 15 March 2006

Abstract

An electronic transition of iron in magnesiowustite has been studied with synchrotron Mössbauer and x-ray emission spectroscopies under high pressures. Synchrotron Mössbauer studies show that the quadrupole splitting disappears and the isomer shift drops significantly across the spin-paring transition of iron in (Mg0.75,Fe0.25)O between 52 and 70GPa. Based upon current results and percolation theory, we reexamine the high-pressure phase diagram of (Mg,Fe)O and find that iron-iron exchange interaction plays an important role in stabilizing the high-spin state of iron in FeO-rich (Mg,Fe)O.

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  • Received 30 January 2006

DOI:https://doi.org/10.1103/PhysRevB.73.113107

©2006 American Physical Society

Authors & Affiliations

Jung-Fu Lin1, Alexander G. Gavriliuk2,3,4, Viktor V. Struzhkin2, Steven D. Jacobsen2, Wolfgang Sturhahn5, Michael Y. Hu6, Paul Chow6, and Choong-Shik Yoo1

  • 1Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
  • 2Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, USA
  • 3Institute for High-Pressure Physics, Troitsk, Moscow oblast, 142190 Russia
  • 4Institute of Crystallography, Russian Academy of Sciences, 117333, Leninskii prospekt 59, Moscow, Russia
  • 5Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
  • 6HPCAT, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Ilinois 60439, USA

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Issue

Vol. 73, Iss. 11 — 15 March 2006

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