Open AccessX‐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
Author(s) -
Lin JungFu,
Struzhkin Viktor V.,
Jacobsen Steven D.,
Shen Guoyin,
Prakapenka Vitali B.,
Mao HoKwang,
Hemley Russell J.
Publication year - 2005
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049505020741
Subject(s) - diamond anvil cell , wüstite , synchrotron , spin transition , spin states , spin crossover , spectroscopy , emission spectrum , diamond , materials science , transition metal , ferrous , single crystal , diffraction , chemistry , analytical chemistry (journal) , crystallography , spectral line , mineralogy , hematite , metallurgy , inorganic chemistry , optics , physics , biochemistry , chromatography , quantum mechanics , astronomy , catalysis
Synchrotron‐based X‐ray emission spectroscopy (XES) is well suited to probing the local electronic structure of 3 d 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‐(Mg 0.75 ,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‐(Mg 0.75 ,Fe 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 3 d transition metals and compounds under extreme high‐ P–T conditions.