Speciation and crystal chemistry of Iron(III) chloride hydrolyzed in the presence of SiO{sub 4} ligands. 1. An Fe K-edge EXAFS study
The hydrolysis of Fe-Si systems with Si/Fe ratios between 0 and 4 leads to the formation of poorly crystalline or, more frequently, of long-range disorganized precipitates. The increase of Si/Fe molar ratios results in a dramatic change of Fe polymerization. The formation of double and single corner-sharing Fe linkages is reduced compared to pure Fe hydrolysis products. The growth regime depends on the Si concentration in the system. Three-dimensional and two-dimensional growth of Fe colloids occurs at low and high Si/Fe ratios, respectively, systems with Si/Fe ratios around 1 representing a crossover between these two regimes. Though Si neighbors cannot be detected unequivocally by Fe K-edge EXAFS, their presence in the close environment of Fe atoms is evident from the change in Fe speciation.
- Research Organization:
- CNRS-Aix-Marseille III, Aix-en-Provence (FR)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE
- DOE Contract Number:
- FC09-96SR18546
- OSTI ID:
- 20080280
- Journal Information:
- Langmuir, Vol. 16, Issue 10; Other Information: PBD: 16 May 2000; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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