High-spin Fe 2+ and Fe 3+ in single-crystal aluminous bridgmanite in the lower mantle

Lin, Jung-Fu; Mao, Zhu; Yang, Jing; Liu, Jin; Xiao, Yuming; Chow, Paul; Okuchi, Takuo

doi:10.1002/2016GL069836

High-spin Fe ²⁺ and Fe ³⁺ in single-crystal aluminous bridgmanite in the lower mantle

Journal Article · Thu Jul 14 00:00:00 EDT 2016 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2016GL069836· OSTI ID:1324801

Lin, Jung-Fu ^[1]; Mao, Zhu ^[2]; Yang, Jing ^[3]; Liu, Jin ^[3]; Xiao, Yuming ^[4]; Chow, Paul ^[4]; Okuchi, Takuo ^[5]

Univ. of Texas, Austin, TX (United States); Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
Univ. of Science and Technology of China, Hefei (China); National Geophysics Observatory, Mengcheng (China)
Univ. of Texas, Austin, TX (United States)
Carnegie Inst. of Science, Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT)
Okayama Univ., Misasa (Japan). Inst. for Planetary Materials

In this work, spin and valence states of iron in single-crystal bridgmanite (Mg_0.89Fe_0.12Al_0.11Si_0.89O₃) are investigated using X-ray emission and Mössbauer spectroscopies with laser annealing up to 115 GPa. The results show that Fe predominantly substitutes for Mg²⁺ in the pseudo-dodecahedral A site, in which 80% of the iron is Fe³⁺ that enters the lattice via the charge-coupled substitution with Al³⁺ in the octahedral B site. The total spin momentum and hyperfine parameters indicate that these ions remain in the high-spin state with Fe²⁺ having extremely high quadrupole splitting due to lattice distortion. (Al,Fe)-bearing bridgmanite is expected to contain mostly high-spin, A-site Fe³⁺, together with a smaller amount of A-site Fe²⁺, that remains stable throughout the region. Even though the spin transition of B-site Fe³⁺ in bridgmanite was reported to cause changes in its elasticity at high pressures, (Fe,Al)-bearing bridgmanite with predominantly A-site Fe will not exhibit elastic anomalies associated with the spin transition.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1324801

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 13 Vol. 43; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Abnormal Elasticity of Fe-Bearing Bridgmanite in the Earth's Lower Mantle Fu, Suyu; Yang, Jing; Zhang, Yanyao Geophysical Research Letters, Vol. 45, Issue 10 https://doi.org/10.1029/2018gl077764	journal	May 2018
First‐Principles Study of Thermodynamics and Spin Transition in FeSiO ₃ Liquid at High Pressure Sun, Yicheng; Zhou, Huiqun; Yin, Kun Geophysical Research Letters, Vol. 46, Issue 7 https://doi.org/10.1029/2018gl081421	journal	April 2019
Valence and spin states of iron are invisible in Earth’s lower mantle Liu, Jiachao; Dorfman, Susannah M.; Zhu, Feng Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-03671-5	journal	March 2018

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58 GEOSCIENCES
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high pressure
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