Pressure-Induced Electronic Spin Transition of Iron in Magnesiow?stite-(Mg,Fe)O

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An electronic transition of iron in magnesiowuestite has been studied with synchrotron Moessbauer and X-ray emission spectroscopies under high pressures. Synchrotron Moessbauer studies show that the quadrupole splitting disappears and the isomer shift drops significantly across the spin-paring transition of iron in (Mg{sub 0.75},Fe{sub 0.25})O between 62 and 70 GPa, whereas X-ray emission spectroscopy of the Fe-K{sub {beta}} fluorescence lines in dilute (Mg{sub 0.95},Fe{sub 0.05})O also confirms that a high-spin to low-spin transition occurs between 46 GPa and 55 GPa. Based upon current results and percolation theory, we reexamine the high-pressure phase diagram of (Mg,Fe)O and find that iron-iron exchange ... continued below

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Lin, J F; Gavriliuk, A G; Struzhkin, V V; Jacobsen, S D; Sturhahn, W; Hu, M Y et al. October 5, 2005.

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An electronic transition of iron in magnesiowuestite has been studied with synchrotron Moessbauer and X-ray emission spectroscopies under high pressures. Synchrotron Moessbauer studies show that the quadrupole splitting disappears and the isomer shift drops significantly across the spin-paring transition of iron in (Mg{sub 0.75},Fe{sub 0.25})O between 62 and 70 GPa, whereas X-ray emission spectroscopy of the Fe-K{sub {beta}} fluorescence lines in dilute (Mg{sub 0.95},Fe{sub 0.05})O also confirms that a high-spin to low-spin transition occurs between 46 GPa and 55 GPa. 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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PDF-file: 21 pages; size: 0 Kbytes

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  • Journal Name: Physical Review, B: Condensed Matter; Journal Volume: 73; Journal Issue: 11

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  • Report No.: UCRL-JRNL-216057
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 885365
  • Archival Resource Key: ark:/67531/metadc892303

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  • October 5, 2005

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  • Sept. 23, 2016, 2:42 p.m.

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  • Nov. 30, 2016, 6:10 p.m.

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Lin, J F; Gavriliuk, A G; Struzhkin, V V; Jacobsen, S D; Sturhahn, W; Hu, M Y et al. Pressure-Induced Electronic Spin Transition of Iron in Magnesiow?stite-(Mg,Fe)O, article, October 5, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc892303/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.