NDLI: Electronic spin state of iron in lower mantle perovskite

Content Provider	PubMed Central
Author	Li, Jie Struzhkin, Viktor V. Mao, Ho-kwang Shu, Jinfu Hemley, Russell J. Fei, Yingwei Mysen, Bjorn Dera, Przemek Vitali, Prakapenka Shen, Guoyin
Copyright Year	2004
Abstract	The electronic spin state of iron in lower mantle perovskite is one of the fundamental parameters that governs the physics and chemistry of the most voluminous and massive shell in the Earth. We present experimental evidence for spin-pairing transition in aluminum-bearing silicate perovskite (Mg,Fe)(Si,Al)O3 under the lower mantle pressures. Our results demonstrate that as pressure increases, iron in perovskite transforms gradually from the initial high-spin state toward the final low-spin state. At 100 GPa, both aluminum-free and aluminum-bearing samples exhibit a mixed spin state. The residual magnetic moment in the aluminum-bearing perovskite is significantly higher than that in its aluminum-free counterpart. The observed spin evolution with pressure can be explained by the presence of multiple iron species and the occurrence of partial spin-paring transitions in the perovskite. Pressure-induced spin-pairing transitions in the perovskite would have important bearing on the magnetic, thermoelastic, and transport properties of the lower mantle, and on the distribution of iron in the Earth's interior.
Related Links	http://dx.doi.org/10.1073/pnas.0405804101
Ending Page	14030
Page Count	4
Starting Page	14027
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	39
Volume Number	101
Language	English
Publisher	National Academy of Sciences
Publisher Date	2004-09-28
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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