Abstract
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 language | English |
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Journal | Nanostructured Materials |
Volume | 12 |
Issue number | 1-4 |
Pages (from-to) | 233-236 |
ISSN | 0965-0773 |
Publication status | Published - 1999 |