Fe II induced mineralogical transformations of ferric oxyhydroxides into magnetite of variable stoichiometry and morphology

M. Usman, M. Abdelmoula, K. Hanna, B. Grégoire, P. Faure, C. Ruby*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

The Mössbauer spectroscopy was used to monitor the mineralogical transformations of ferrihydrite (F), lepidocrocite (L) and goethite (G) into magnetite as a function of aging time. Ferric oxyhydroxides were reacted with soluble Fe II and OH - in stoichiometric amounts to form magnetite at an initial pH of ∼9.7. Observed transformation extent into magnetite followed the order: F>L>G with almost 30% of untransformed G after 1 month. The departure from stoichiometry, δ, of magnetite (Fe 3-δO 4) generated from F (δ∼0.04) and L (δ∼0.05) was relatively low as compared to that in magnetite from G (δ∼0.08). The analysis by transmission electron microscopy and BET revealed that generated magnetite was also different in terms of morphology, particle size and surface area depending on the nature of initial ferric oxyhydroxide. This method of preparation is a possible way to form nano-sized magnetite.

Original languageEnglish
Pages (from-to)328-335
Number of pages8
JournalJournal of Solid State Chemistry
Volume194
DOIs
Publication statusPublished - Oct 2012
Externally publishedYes

Keywords

  • Ferrihydrite
  • Goethite
  • Lepidocrocite
  • Magnetite
  • Mössbauer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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