Effects of the Fe3+ spin transition on the equation of state of bridgmanite

Mao, Zhu; Lin, Jung‐Fu; Yang, Jing; Inoue, Toru; Prakapenka, Vitali B.

doi:10.1002/2015gl064400

Title: Effects of the Fe³⁺ spin transition on the equation of state of bridgmanite

Journal Article · Mon May 18 00:00:00 EDT 2015 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2015gl064400· OSTI ID:1197035

Mao, Zhu ^[1]; Lin, Jung‐Fu ^[2]; Yang, Jing ^[3]; Inoue, Toru ^[4]; Prakapenka, Vitali B. ^[5]

Univ. of Texas, Austin, TX (United States). Dept. of Geological Sciences. Jackson School of Geosciences; Univ. of Science and Technology of China, Hefei (China). Lab. of Seismology and Physics of Earth's Interior. School of Earth and Planetary Sciences; National Geophysics Observatory at Mengcheng (China)
Univ. of Texas, Austin, TX (United States). Dept. of Geological Sciences. Jackson School of Geosciences; Center for High Pressure Science and Advanced Technology Research (HPSTAR), Shanghai (China)
Univ. of Texas, Austin, TX (United States). Dept. of Geological Sciences. Jackson School of Geosciences
Ehime Univ., Matsuyama (Japan). Geodynamics Research Center
Univ. of Chicago, IL (United States). GeoSoilEnviroCARS

We have investigated the equation of state of Fe-bearing bridgmanite, (Mg_0.9Fe_0.1)SiO₃, using synchrotron X-ray diffraction in diamond anvil cells up to 125 GPa and 300 K. Combined with previous synchrotron Mössbauer spectroscopy results, we have found that the occurrence of the low-spin Fe³⁺ in the octahedral sites (B site) of bridgmanite has produced a 0.5(±0.1)% reduction in the unit cell volume at 18–25 GPa and has increased the isothermal bulk modulus to 284(±4) GPa, consistent with recent theoretical calculations. Together with literature results, we note that the addition of Fe can cause an increase in the density, bulk modulus, and bulk sound velocity in both Al-free and Al-bearing bridgmanite at lower mantle pressures. The presence of Fe³⁺ in the B site of bridgmanite can further enhance this increase. The observed spin transition of B site Fe³⁺ in bridgmanite is thus important for understanding the density and velocity structures of the lower mantle.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Univ. of Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; FG02-94ER14466

OSTI ID:: 1197035

Journal Information:: Geophysical Research Letters, Vol. 42, Issue 11; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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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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Title: Effects of the Fe3+ spin transition on the equation of state of bridgmanite

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Title: Effects of the Fe³⁺ spin transition on the equation of state of bridgmanite