X-ray emission spectroscopy with a laser-heated diamond anvil cell: A new experimental probe of the spin state of iron in the Earth's interior

Jung Fu Lin*, Viktor V. Struzhkin, Steven D. Jacobsen, Guoyin Shen, Vitali B. Prakapenka, Ho Kwang Mao, Russell J. Hemley

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Synchrotron-based X-ray emission spectroscopy (XES) is well suited to probing the local electronic structure of 3d transition metals such as Fe and Mn in their host phases. The laser-heated diamond anvil cell technique is uniquely capable of generating ultra-high static pressures and temperatures in excess of 100 GPa and 3000 K. Here X-ray emission spectroscopy and X-ray diffraction have been interfaced with the laser-heated diamond cell for studying the electronic spin states of iron in magnesiowüstite-(Mg0.75,Fe 0.25)O and its crystal structure under lower-mantle conditions. X-ray emission spectra of the ferrous iron in a single crystal of magnesiowüstite-(Mg0.75,Fe0.25)O indicate that a high-spin to low-spin transition of ferrous iron occurs at 54 to 67 GPa and 300 K and the ferrous iron remains in the high-spin state up to 47 GPa and 1300 K. This pilot study points to the unique capability of the synchrotron-based XES and X-ray diffraction techniques for addressing the issue of electronic spin transition or crossover in 3d transition metals and compounds under extreme high-P-T conditions.

Original languageEnglish (US)
Pages (from-to)637-641
Number of pages5
JournalJournal of Synchrotron Radiation
Volume12
Issue number5
DOIs
StatePublished - Sep 1 2005

Keywords

  • Electronic spin state
  • High pressure
  • Laser-heated diamond cell
  • Magnesiowüstite
  • X-ray emission spectroscopy

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation

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