Preparation of barium iron oxides by the oxidation of iron in the Fe-Ba(OH)2-NaOH-H2O-O2 system

S. Uchida, H. Kashiwagi, T. Sato, A. Okuwaki

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    2 Citations (Scopus)


    Iron was oxidized in the Fe-Ba(OH)2-NaOH-H2O-O2 system at elevated temperatures. Fe3O4 and α-FeOOH were formed in the absence of oxygen. On the other hand, hexagonal plate-like particles of BaFe12O19, 1.0-4.3 μm diameter, were formed as single phase by the oxidation of iron in Ba(OH)2 and NaOH mixed solutions at 250-300°C and above 1.0 MPa oxygen. The diameter of the particle significantly depended on the NaOH concentration. Additives such as CO32-, SO42- and CH3COO- promoted the grain growth of BaFe12O19.

    Original languageEnglish
    Pages (from-to)4625-4628
    Number of pages4
    JournalJournal of Materials Science
    Issue number17
    Publication statusPublished - 1996 Jan 1

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

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