X-ray microprobe analysis of iron oxidation states in silicates and oxides using X-ray absorption near edge structure (XANES)

Details X-ray microprobe analysis of iron oxidation states in silicates and oxides using X-ray absorption near edge structure (XANES) X-ray microprobe analysis of iron oxidation states in silicates and oxides using X-ray absorption near edge structure (XANES)

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.5209b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 23, pp.5209-5214

Physics

25

Scientific paper

Initial results are reported on a new microprobe technique for determining Fe 3+ / Fe ratios in Fe-bearing minerals. The technique is based on the energy shift of a pre-edge peak in X-ray absorption near-edge structure (XANES) spectra obtained using the synchrotron X-ray fluorescence microprobe. A linear relationship between pre-edge peak energy and iron oxidation state was observed for oxide and silicate standards. Reasonable iron oxidation state results were obtained for pallasitic olivine, acmite, altered magnetites and synthetic wüstite. Direct measurements of Fe 3+ / Fe in coexisting phases is feasible using this technique.

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