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Letter. Iron partitioning between perovskite and post-perovskite: A transmission electron microscope study
-
Kei Hirose
,
Naoto Takafuji
Published/Copyright:
April 1, 2015
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.
Received: 2008-4-17
Accepted: 2008-5-15
Published Online: 2015-4-1
Published in Print: 2008-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Perovskite;
post-perovskite;
iron partitioning;
phase transition;
D″ layer
Articles in the same Issue
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- Amorphous Materials: Properties, structure, and durability: Oxidation state of iron in hydrous phono-tephritic melts
- Amorphous materials: Properties, structure, and durability: Quantitative Raman spectroscopy: Speciation of Na-silicate glasses and melts
- Dissolution-reprecipitation of zircon at low-temperature, high-pressure conditions (Lanzo Massif, Italy)
- High-pressure behavior of gypsum: A single-crystal X-ray study
- Presence and zoning of hydrous components in leucite from the Alban Hills volcano, Rome, Italy
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- Application of Raman spectroscopy to quantify trace water concentrations in glasses and garnets
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- Leucite at high pressure: Elastic behavior, phase stability, and petrological implications
- Thermodynamic mixing properties of Rb-K feldspars
- Demicheleite, BiSBr, a new mineral from La Fossa crater, Vulcano, Aeolian Islands, Italy
- A lattice dynamical study of the aragonite and post-aragonite phases of calcium carbonate rock
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