Magnetic properties of nanometer-scale ion particles generated by iron atom clustering in cold pentane
- Kansas State Univ., Manhattan (USA)
Nanometer-scale iron particles have been prepared by iron atom clustering in cold pentane. Particle growth was terminated by adsorption of oleic acid, yielding air-stable particles ranging in size from 2 to 12 nm, that were amorphous according to XRD analysis. TEM analysis showed that the larger particles were prolate spheroids and the smaller ones were spherical. The original sample had a room-temperature saturation magnetization of M{sub s} = 12.3 emu/g and a coercivity of H{sub c} = 60 Oe. Following heat treatment with argon, the XRD results showed the following reaction scheme: oxidation to Fe{sub 3}O{sub 4} at 360{degree}C and reduction to {alpha}-Fe at 520{degree}C (processes apparently due to adsorbed oleic acid). For the 520{degree}C treated sample, the room-temperature saturation magnetization and coercivity were M{sub s} = 200 emu/g and H{sub c} = 20 Oe, respectively. By pentane washing of the as-prepared sample, the smaller particles could be separated by filtration, leaving the larger 8-12-nm particles on the filter. This powdered sample trapped on the filter had M{sub s} = 54.9 emu/g and H{sub c} = 60 Oe. Heat treatment also caused oxidation to Fe{sub 3}O{sub 4} at 360{degree}C and an incomplete reduction to {alpha}-Fe and FeO at 520{degree}C. For the 520{degree}C treated sample, the recorded room-temperature saturation magnetization and coercivity were M{sub s} = 123.6 emu/g and H{sub c} = 20 Oe, respectively.
- OSTI ID:
- 6726139
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 2:1; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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DATA
DATA ANALYSIS
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
IRON COMPOUNDS
MAGNETIC PROPERTIES
MEASURING INSTRUMENTS
MEASURING METHODS
MICROSCOPY
NUMERICAL DATA
PHYSICAL PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY