Title :
Mossbauer studies of colloidal ultrafine particles of iron
Author :
Furubayashi, T. ; Nakatani, I.
Author_Institution :
Nat. Res. Inst. for Metals, Tokyo, Japan
fDate :
9/1/1990 12:00:00 AM
Abstract :
Mossbauer studies of ultrafine particles of iron are reported. The particles have an average diameter of 2 nm and are dispersed in oil by a surface-active agent. The Mossbauer spectrum at 4.2 K consisted of a ferromagnetic and a paramagnetic component. The paramagnetic component was shown to disappear when the sample was kept at room temperature. It is concluded that particles having diameters less than a certain value are paramagnetic
Keywords :
Mossbauer effect; iron; magnetic fluids; magnetic properties of fine particles; particle size; 2 nm; 4.2 K; Fe particles; Mossbauer spectrum; Mossbauer studies; colloidal ultrafine particles; ferromagnetic component; oil; paramagnetic component; surface-active agent; Hydrocarbons; Iron; Magnetic field measurement; Magnetic liquids; Magnetic properties; Magnetization; Paramagnetic materials; Petroleum; Spectroscopy; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
