(NH4)3FeF6 mesocrystals grown by electric field-assisted in situ dissolution and the reaction of anodic iron oxides

Abstract

(NH₄)₃FeF₆ mesocrystalline octahedrons are formed by in situ dissolution and the reaction of anodic iron oxides, followed by a non-classical crystal growth process involving electrical polarization and subsequent alignment of primary (NH₄)₃FeF₆ particles under an external electric field. The obtained (NH₄)₃FeF₆ can be converted to nano-micro hierarchical α-Fe₂O₃ octahedrons by thermal annealing.