Microstructural behavior of γ-Fe2O3 formation in reactions between layered iron oxychloride and sodium n-pentoxide

Takeshi Shiono, Fumiaki Tando, Hiromi Nakano, Yoshiyuki Sugahara

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Microstructural behavior of γ-Fe2O3 formation in reactions between FeOCl and n-C5H11ONa was thoroughly investigated. Reactions were conducted at 50-150 °C for 3 days in an autoclave using n-C5H11OH as a solvent. X-ray diffraction (XRD) patterns and infrared (IR) spectra of the products suggested the crystallization of γ-Fe2O3 besides the formation of n-pentoxy derivatives of FeOCl. Scanning electron microscopic observation revealed that the FeOCl particles were divided into thin sheets upon reaction. The selected area electron diffractions (SAED) of the sheets revealed the crystallization of γ-Fe2O3 at even 80 °C, apparently due to the fact that the γ-Fe2O3 crystallization process involved a collapse from n-pentoxide derivatives with large separations between two adjacent layers. In the reaction at 150 °C, a part of the sheets was converted into highly oriented polycrystalline γ-Fe2O3 in improved crystallinity, and the SAED clearly showed that an oriented transformation with a crystallographic relationship of FeOCl (010)//γ-Fe2O3 (110) occurred. The reaction at 120 °C, on the contrary, led to the formation of randomly oriented γ-Fe2O3 crystallites within a sheet.

    Original languageEnglish
    Pages (from-to)156-161
    Number of pages6
    JournalSolid State Sciences
    Volume19
    DOIs
    Publication statusPublished - 2013

    Fingerprint

    Crystallization
    Sodium
    sodium
    Iron
    iron
    Electron diffraction
    Derivatives
    crystallization
    Autoclaves
    Crystallites
    electron diffraction
    Diffraction patterns
    autoclaves
    Infrared radiation
    Scanning
    X ray diffraction
    Electrons
    crystallites
    crystallinity
    infrared spectra

    Keywords

    • γ-FeO
    • FeOCl
    • Organic derivatization
    • Transmission electron microscope

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics

    Cite this

    Microstructural behavior of γ-Fe2O3 formation in reactions between layered iron oxychloride and sodium n-pentoxide. / Shiono, Takeshi; Tando, Fumiaki; Nakano, Hiromi; Sugahara, Yoshiyuki.

    In: Solid State Sciences, Vol. 19, 2013, p. 156-161.

    Research output: Contribution to journalArticle

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