Mechanical milling of Fe3O4/SiO2: Formation of an amorphous Fe(II)-Si-O-containing phase

C.B. Koch, Jianzhong Jiang, Steen Mørup

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The product of ball milling of magnetite and amorphous silica (40 mole% Fe3O4 in SiO2) for an extended period of time (800 h) in a closed vial, has been investigated by Mossbauer spectroscopy, X-ray diffraction and infrared spectroscopy. It is found that the milling induces extensive reduction of Fe(III). The material constitutes a mixture of ultrafine Fe-rich spinel particles (magnetite/maghemite) and ail amorphous Fe(II)-containing silicate with a magnetic transition temperature of approximately 25 K. The amorphous phase has a rather high Fe content and is distinctly differenct from the initial amorphous silica.
Original languageEnglish
JournalNanostructured Materials
Issue number1-4
Pages (from-to)233-236
Publication statusPublished - 1999

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