Nucleation and growth of Fe(III)/PO_4 clusters

摘要

The first stages of the hydrolysis of Fe(III) in presence of PO_4 were studied at the local (P k-edge and Fe k-edge EXAFS spectroscopy) and semi-local scale (SAXS). The presence of PO_4 hinders the polymerization of iron at the edge sharing dimer step. Phosphate probably govers the local structure leading to the formation of small and dense clusters. The fitting of both k-edge EXAFS spectroscopies requiered the use of a new 3D model of each nucleation step.