Abstract
In situ measurements of X-ray absorption spectra at an Fe K absorption edge were carried out during the transformation of chloride-containing green rust (GR(Cl-)) to oxyhydroxide (that is, lepidocrocite (γ - FeOOH)), by oxidation via aqueous solution. Results showed that the Fe K absorption edge in X-ray absorption near-edge structure (XANES) spectrum shifted toward the higher energy side with increasing oxidation time. The factor analysis of the XANES spectra, using reference data, implied that dissolution of GR(Cl -) and precipitation of γ -FeOOH occur simultaneously. The fraction of γ -FeOOH in the suspension increased continuously with increasing oxidation time, in response to the continuous decrease of the fraction of GR(Cl-). The results lead us to conclude that GR(Cl -) transforms to γ -FeOOH during oxidation under the present experimental conditions.
Original language | English |
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Pages (from-to) | 125-130 |
Number of pages | 6 |
Journal | Isij International |
Volume | 54 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2014 |
Keywords
- Corrosion
- EXAFS
- Lepidocrocite
- XANES
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry