Oxidation state and coordination of Fe in minerals: An Fe <i>K-</i> XANES spectroscopic study
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Abstract
High-resolution Fe K-edge XANES spectra of a series of crystalline Fe2+- and Fe3+-bearing model compounds were measured in an effort to correlate characteristics of the pre-edge feature with oxidation state and local coordination environment of Fe atoms. The model compounds comprise 30 natural minerals and synthetic compounds, with Fe coordination environments ranging from 4 to 12 O atoms for Fe2+, including 5-coordinated trigonal bipyramidal Fe2+, and from 4 to 6 O atoms for Fe3+. Most pre-edge spectra show two components (due to crystal-field splitting) that are located just above the Fermi level.
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The record
- Venue
- American Mineralogist
- Topic
- Geological and Geochemical Analysis
- Field
- Earth and Planetary Sciences
- Canadian institutions
- —
- Funders
- Basic Energy SciencesLawrence Berkeley National LaboratoryBiological and Environmental ResearchUniversité de MontréalUniversité Laval
- Keywords
- XANESOxidation stateTrigonal bipyramidal molecular geometrySpectral lineCrystallographyCoordination numberChemistryK-edgeMaterials scienceCrystal structureMetalPhysicsIon
- Has abstract in OpenAlex
- yes