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

Journal Article · Mon Jul 19 04:00:00 EDT 2010 · J. Synchrotron Rad.

OSTI ID:1008547

Lin, J -F; Struzhkin, V V; Jacobsen, S D; Shen, G; Prakapenka, V B; Mao, H -K; Hemley, R J ^[1]

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1. CIW

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 magnesiowuestite-(Mg{sub 0.75},Fe{sub 0.25})O and its crystal structure under lower-mantle conditions. X-ray emission spectra of the ferrous iron in a single crystal of magnesiowuestite-(Mg{sub 0.75},Fe{sub 0.25})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.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: USDOE
• OSTI ID: 1008547
• Journal Information: J. Synchrotron Rad., Journal Name: J. Synchrotron Rad. Journal Issue: (5) ; 2005 Vol. 12; ISSN 0909-0495; ISSN JSYRES
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
DIAMONDS
ELECTRONIC STRUCTURE
EMISSION SPECTRA
EMISSION SPECTROSCOPY
HIGH SPIN STATES
IRON
MONOCRYSTALS
PROBES
SPIN
TRANSITION ELEMENTS
X-RAY DIFFRACTION