Iron partitioning between perovskite and post-perovskite: A transmission electron microscope study

Kei Hirose; Naoto Takafuji; Kiyoshi Fujino; Sean R. Shieh; Thomas S. Duffy

doi:10.2138/am.2008.3001

Iron partitioning between perovskite and post-perovskite: A transmission electron microscope study

Kei Hirose, Naoto Takafuji, Kiyoshi Fujino, Sean R. Shieh, Thomas S. Duffy

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

The effect of iron on the post-perovskite phase transition has been controversial. We have performed direct chemical analyses of co-existing perovskite and post-perovskite that were synthesized from an (Mg_0.91Fe_0.09)SiO₃ bulk composition using a laser-heated diamond anvil cell at pressures above 100 GPa and temperatures of 1700-1800 K. Analysis on quenched samples was carried out using the transmission electron microscope (TEM). The results demonstrate that crystalline perovskite grains are enriched in iron compared to adjacent amorphous parts presumably converted from post-perovskite. This indicates that ferrous iron stabilizes perovskite to higher pressures. The ferrous and ferric irons are likely to have competing effects on the post-perovskite phase transition, and therefore the effect of iron may be controlled by aluminum.

Original language	English (US)
Pages (from-to)	1678-1681
Number of pages	4
Journal	American Mineralogist
Volume	93
Issue number	10
DOIs	https://doi.org/10.2138/am.2008.3001
State	Published - Oct 2008

All Science Journal Classification (ASJC) codes

Geophysics
Geochemistry and Petrology

Keywords

D″layer
Iron partitioning
Perovskite
Phase transition
Post-perovskite

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10.2138/am.2008.3001

Cite this

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title = "Iron partitioning between perovskite and post-perovskite: A transmission electron microscope study",

abstract = "The effect of iron on the post-perovskite phase transition has been controversial. We have performed direct chemical analyses of co-existing perovskite and post-perovskite that were synthesized from an (Mg0.91Fe0.09)SiO3 bulk composition using a laser-heated diamond anvil cell at pressures above 100 GPa and temperatures of 1700-1800 K. Analysis on quenched samples was carried out using the transmission electron microscope (TEM). The results demonstrate that crystalline perovskite grains are enriched in iron compared to adjacent amorphous parts presumably converted from post-perovskite. This indicates that ferrous iron stabilizes perovskite to higher pressures. The ferrous and ferric irons are likely to have competing effects on the post-perovskite phase transition, and therefore the effect of iron may be controlled by aluminum.",

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year = "2008",

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T1 - Iron partitioning between perovskite and post-perovskite

T2 - A transmission electron microscope study

AU - Hirose, Kei

AU - Takafuji, Naoto

AU - Fujino, Kiyoshi

AU - Shieh, Sean R.

AU - Duffy, Thomas S.

PY - 2008/10

Y1 - 2008/10

N2 - The effect of iron on the post-perovskite phase transition has been controversial. We have performed direct chemical analyses of co-existing perovskite and post-perovskite that were synthesized from an (Mg0.91Fe0.09)SiO3 bulk composition using a laser-heated diamond anvil cell at pressures above 100 GPa and temperatures of 1700-1800 K. Analysis on quenched samples was carried out using the transmission electron microscope (TEM). The results demonstrate that crystalline perovskite grains are enriched in iron compared to adjacent amorphous parts presumably converted from post-perovskite. This indicates that ferrous iron stabilizes perovskite to higher pressures. The ferrous and ferric irons are likely to have competing effects on the post-perovskite phase transition, and therefore the effect of iron may be controlled by aluminum.

AB - The effect of iron on the post-perovskite phase transition has been controversial. We have performed direct chemical analyses of co-existing perovskite and post-perovskite that were synthesized from an (Mg0.91Fe0.09)SiO3 bulk composition using a laser-heated diamond anvil cell at pressures above 100 GPa and temperatures of 1700-1800 K. Analysis on quenched samples was carried out using the transmission electron microscope (TEM). The results demonstrate that crystalline perovskite grains are enriched in iron compared to adjacent amorphous parts presumably converted from post-perovskite. This indicates that ferrous iron stabilizes perovskite to higher pressures. The ferrous and ferric irons are likely to have competing effects on the post-perovskite phase transition, and therefore the effect of iron may be controlled by aluminum.

KW - D″layer

KW - Iron partitioning

KW - Perovskite

KW - Phase transition

KW - Post-perovskite

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Iron partitioning between perovskite and post-perovskite: A transmission electron microscope study

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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