1. Iron spin state in silicate perovskite at conditions of the Earth's deep interior
- Author
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McCammon, Catherine, Glazyrin, Konstantin, Kantor, Anastasia, Kantor, Innokenty, Kupenko, Ilya, Narygina, Olga, Potapkin, Vasily, Prescher, Clemens, Sinmyo, Ryosuke, Chumakov, Alexandr, Rueffer, Rudolf, Sergueev, Ilya, Smirnov, Gennady, and Dubrovinsky, Leonid
- Subjects
Spin states ,Chemistry ,Silicate perovskite ,Analytical chemistry ,Spin transition ,Mineralogy ,Condensed Matter Physics ,Diamond anvil cell ,Physics::Geophysics ,Mössbauer spectroscopy ,Condensed Matter::Strongly Correlated Electrons ,Emission spectrum ,Hyperfine structure ,Perovskite (structure) - Abstract
We present a review of our recent work concerning the spin state of Fe2+ and Fe3+ in iron magnesium aluminium silicate perovskite, the most abundant phase in the Earth's interior. Experimental results obtained using Mossbauer spectroscopy (with a radioactive source and a Synchrotron Mossbauer Source) and nuclear forward scattering for a range of different sample compositions in both externally heated and laser-heated diamond anvil cells show clear trends in the variation of hyperfine parameters with pressure and temperature. These trends combined with reported total spin state measurements using X-ray emission spectroscopy on samples of similar composition support the conclusion that Fe2+ undergoes a high-spin to intermediate-spin transition near the top of the lower mantle and an intermediate-spin to low-spin transition near the bottom of the lower mantle. No spin transition is observed to occur in Fe3+ for samples with compositions relevant for the lower mantle.
- Published
- 2013
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