Microanalysis of iron oxidation states in earth and planetary materials

Details Microanalysis of iron oxidation states in earth and planetary materials Microanalysis of iron oxidation states in earth and planetary materials

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phyb..208..243b&link_type=abstract

Physica B: Physics of Condensed Matter, Volume 208, Issue 1-4, p. 243-244.

Physics

Condensed Matter

1

Scientific paper

Initial studies have been made on quantifying Fe oxidation states in different iron-bearing minerals using K-edge XANES. The energy of a weak pre-edge peak in the XANES spectrum due to 1s-3d electron transition was used to quantify ferric/ferrous ratios with microprobe spatial resolution. The estimated accuracy of the technique was +/- 10% in terms of Fe3+/((Fe2+ + Fe3+)). The detection limit was ~ 100 ppm with a synchrotron beam of ~ 100 μm in diameter. The pre-edge peak energy in well-characterized samples with known Fe oxidation states was found to be a linear function of the ferric/(ferrous) ratio. The technique was applied to altered magnetics (ideally Fe3O4), and various silicates and oxides from meteorites.

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