[T10] Other Processing

[16P-T10-07] Preparation of Lepidocrocite and Maghemite by the Addition of Calcite into Iron(Ⅱ) Chloride Solution

*N. Arinobu¹, R. Maki¹, T. Ogawa², T. Fujii³, Y. Kusano¹ (1.Okayama University of Science, Japan, 2.Tohoku University, Japan, 3.Okayama University, Japan)

Keywords:iron oxides, formation mechanism, microstructure

Maghemite (γ-Fe₂O₃) has attracted much attention as a consequence of the unique magnetic, electrical and medical properties. Maghemite is produced by the oxidation of magnetite (Fe₃O₄) or the dehydration of lepidocrocite (γ-FeOOH). Lepidocrocite is obtained by oxidizing an iron(Ⅱ) chloride solution at pH≈6.0. We found that lepidocrocite is obtained by the addition of calcite into the iron(Ⅱ) chloride solution. Maghemite was also found to be obtained by this reaction. We report formation mechanisms of lepidocrocite and maghemite, and also microstructures and magnetic properties of the samples obtained in this study.