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X-ray K-edge absorption spectra of Fe minerals and model compounds: Near-edge structure |
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| Authors: | Glenn A. Waychunas Michael J. Apted Gordon E. Brown Jr. |
| Affiliation: | 1. Center for Materials Research and Geology Department, Stanford University, 94305, Stanford, California, USA 2. Rockwell Hanford Operations, P.O. Box 800, 99352, Richland, Washington, USA 3. Geology Department, Stanford University, 94305, Stanford, California, USA |
| Abstract: | Synchrotron radiation has been used to collect high-resolution Fe K absorption near-edge spectra of a suite of Fe minerals and compounds having a range of Fe environments. These spectra, along with those of previous workers, indicate that the number, position, and intensity of near-edge features are characteristic of Fe valence and general site geometry. For example, the crest of the K-edge for Fe2+ in a six-coordinated site in the oxides studied is about 3 eV lower in energy than that for Fe3+ in a similar site. The K-edge crest for Fe3+ in a four-coordinated site is 1 to 2 eV lower than for Fe3+ in a regular site. The shape of the edge crest is sensitive to the details of first-neighbor bonding distances, tending to be broader in species with irregular Fe sites and varying in energy according to the average bond length. Comparison with Ca2+ and Zn2+ spectra from the literature is made and the applicability and utility of edge measurements discussed. |
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