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Fe(III)-Si systems at various Si/Fe molar ratios and pH values were examined at the local and semi-local scale. The growth of Fe species is strongly dependent on the Si concentration: at Si/Fe<1, the presence of edge and corner Fe-Fe linkages indicates a three dimensional growth regime, whereas for Si/Fe>1, the predominance of edge linkages corresponds to a two dimensional growth. Si-O-Fe and...
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