Brahma, P. ; Dutta, S. ; Pal, M. ; Chakravorty, D. (2006) Magnetic and transport properties of nanostructured ferric oxide produced by mechanical attrition Journal of Applied Physics, 100 (4). 044302_1-044302_6. ISSN 0021-8979
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Official URL: http://jap.aip.org/resource/1/japiau/v100/i4/p0443...
Related URL: http://dx.doi.org/10.1063/1.2227669
Abstract
Nanosized particles of α-Fe2O3 in the range of 7-11 nm were produced by subjecting micron-sized α-Fe2O3 powder to ball milling for durations extending to 10 h. The magnetization of the powder was found to decrease as the particle size was reduced. Detailed electrical measurements of the compacted powder of different ball milled samples showed a drastic change in dc resistivity variation as a function of temperature. Two activated processes were observed with activation energies of ~0.06 and ~0.7 eV, respectively. These are ascribed to a polaron hopping conduction between Fe2+ and Fe3+ sites of neighboring nanoparticles. Large and small particle sizes are responsible for the two activation energies.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| Keywords: | Iron Compounds; Nanoparticles; Magnetic Particles; Ball Milling; Magnetisation; Particle Size; Compaction; Electrical Resistivity; Magnetic Polarons |
| ID Code: | 65581 |
| Deposited On: | 17 Oct 2011 03:36 |
| Last Modified: | 17 Oct 2011 03:36 |
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