Abstract

Fe and Fe3O4 nanowires have been synthesized by thermal decomposition of Fe(CO)5, followed by heat treatments. The Fe wires are formed through the aggregation of nanoparticles generated by decomposition of Fe(CO)5. A core-shell structure with an iron oxide shell and Fe core is observed for the as-prepared Fe wires. Annealing in air leads to the formation of Fe2O3/Fe3O4 wires, which after heat treatment in a N2/alcohol atmosphere form Fe3O4 wires with a sharp Verwey [Nature (London) 144, 327 (1939)] transition at 125 K. The Fe3O4 wires have coercivities of 261 and 735 Oe along the wire axis at RT and 5 K, respectively. The large increase of coercivity at 5 K as compared to RT is due to the increase of anisotropy resulting from the Verwey transition.

Department(s)

Materials Science and Engineering

Second Department

Physics

Third Department

Chemistry

Sponsor(s)

United States. Department of Energy

Keywords and Phrases

Annealing; Coercive Force; Ferromagnetic Materials; Iron; Iron Compounds; Metal-Insulator Transition; Nanotechnology; Nanowires; Pyrolysis

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2006 American Institute of Physics (AIP), All rights reserved.

Included in

Chemistry Commons

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