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A method for the preparation of amorphous Fe 3 O 4 powder with a particle size of ca. 25 nm is reported. Amorphous Fe 3 O 4 powder can be simply synthesized by slowly exposing amorphous Fe powder to the air. The amorphous properties of Fe 3 O 4 nanoparticles were characterized by X-ray diÂraction, Mö ssbauer spectroscopy, transmission electron micrography, diÂerential scanning calorimetry and quantum design SQUID magnetization measurements. This amorphous Fe 3 O 4 powder is superparamagneticdoi:10.1039/a606739e fatcat:5s6sqqcybzhw5nn4yw4n4pfjuu