Unexpected 3+ valence of iron in FeO\(_2\), a geologically important material lying "in between" oxides and peroxides

Recent discovery of pyrite FeO\(_2\), which can be an important ingredient of the Earth's lower mantle and which in particular may serve as an extra source of water in the Earth's interior, opens new perspectives for geophysics and geochemistry, but this is also an extremely interesting ma...

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Bibliographic Details
Published in:arXiv.org 2017-10
Main Authors: Streltsov, S V, Shorikov, A O, Skornyakov, S L, Poteryaev, A I, Khomskii, D I
Format: Article
Language:English
Subjects:
Earth mantle
Electronic structure
Geochemistry
Geophysics
Iron
Magnetic properties
Organic chemistry
Peroxides
Pyrite
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Summary:Recent discovery of pyrite FeO\(_2\), which can be an important ingredient of the Earth's lower mantle and which in particular may serve as an extra source of water in the Earth's interior, opens new perspectives for geophysics and geochemistry, but this is also an extremely interesting material from physical point of view. We found that in contrast to naive expectations Fe is nearly 3+ in this material, which strongly affects its magnetic properties and makes it qualitatively different from well known sulfide analogue - FeS\(_2\). Doping, which is most likely to occur in the Earth's mantle, makes FeO\(_2\) much more magnetic. In addition we show that unique electronic structure places FeO\(_2\) "in between" the usual dioxides and peroxides making this system interesting both for physics and solid state chemistry.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.08085