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Oxidation state and coordination of Fe in minerals: An Fe <i>K-</i> XANES spectroscopic study

2001· article· en· 1,092 citations· W2339510751 on OpenAlex· 10.2138/am-2001-5-612

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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