Short- to Medium-Range Atomic Order and Crystallite Size of the Initial FeS Precipitate from Pair Distribution Function Analysis
| Autor: | J. B. Parise, Sytle M. Antao, M. A. A. Schoonen, F. M. Michel, Peter J. Chupas, Peter L. Lee |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Chemistry of Materials. 17:6246-6255 |
| ISSN: | 1520-5002 0897-4756 |
| Popis: | Pair distribution function analysis (PDF) of X-ray diffraction data, collected at 11-IDC and 1-ID at the Advanced Photon Source, provides the atomic structure and primary crystallite size of FeS both freshly precipitated (FeSfresh) and aged (FeSaged). The short- to medium-range structure of both FeSfresh and FeSaged are nearly identical with that of highly crystalline (bulk) mackinawite. Attenuation in the observed range of structural coherence of the PDF for FeSfresh indicates an average crystallite size on the order of ∼2 nm. This range of structural coherence increased with aging of the sample under hydrothermal conditions due to growth of the individual crystallites, although the mechanism by which this growth occurs is not clear at present. Electron microscopic imaging confirms the presence of individual nanoscale crystallites and provides some insight into their aggregation behavior as larger clusters. The initial, fresh precipitate does not exhibit long-range atomic structure because it is nanocrys... |
| Databáze: | OpenAIRE |
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