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Ferrihydrite: Surface Structure and Its Effects on Phase Transformation
Abstract
X-ray absorption fine structure (XAFS) spectra were collected on a series of ferrihydrite samples prepared over a range of precipitation and drying conditions. Analysis of the XAFS pre-edge structures shows clear evidence of the presence of lower coordination sites in the material. These sites, which are most likely tetrahedral, are believed to be at the surface and become coordination unsaturated (CUS) after dehydroxylation. With chemisorbed water molecules, the CUS sites become the crystal growth sites responsible for the phase transformation of ferrihydrite to hematite at low temperatures. On the other hand, when impurity anions such as SiO 4−4 are present in the precipitation solution, the CUS sites may instead absorb the impurity anions, thereby blocking the crystal growth sites and inhibiting the formation of hematite.
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Citations
Cited by
Occurrence and Constitution of Natural and Synthetic Ferrihydrite, a Widespread Iron Oxyhydroxide
Jambor, J. L., & Dutrizac, J. E. (1998) · Chemical Reviews · doi:10.1021/cr970105t · Cited by 916
Competing Fe (II)-induced mineralization pathways of ferrihydrite
Hansel, C. M., Benner, S. G., & Fendorf, S. (2005) · Environmental Science & Technology · doi:10.1021/es050666z · Cited by 619
Waychunas, G. A., Kim, C. S., & Banfield, J. F. (2005) · Journal of Nanoparticle Research · doi:10.1007/s11051-005-6931-x · Cited by 616
Size-dependent structural transformations of hematite nanoparticles. 1. Phase transition
Chernyshova, I. V., Hochella Jr, M. F., & Madden, A. S. (2007) · Physical Chemistry Chemical Physics · doi:10.1039/b618790k · Cited by 463
Transmission Electron Microscopy of Synthetic 2- and 6-Line Ferrihydrite
Janney, D. E., Cowley, J. M., & Buseck, P. R. (2000) · Clays and Clay Minerals · doi:10.1346/ccmn.2000.0480114 · Cited by 227
Metadata
- Authors
- Zhao, J., Huggins, F. E., Feng, Z., & Huffman, G. P.
- Venue
- Clays and Clay Minerals
- Publisher
- Cambridge University Press (CUP)
- Published
- 1994-12
- Volume
- 42
- Issue
- 6
- Pages
- 737-746
- ISSN
- 0009-8604 (ISSN-L)
- 1552-8367
- OpenAlex
- W1951468408
- Cited by
- 226
- References
- 0
- FWCI
- 3.37
- Type
- journal article
- Language
- en
- Open access
- closed
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- Zhao, J., Huggins, F. E., Feng, Z., & Huffman, G. P. (1994). Ferrihydrite: Surface Structure and Its Effects on Phase Transformation. Clays and Clay Minerals. https://doi.org/10.1346/ccmn.1994.0420610
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