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Fe1−yO Nanoparticles: Organometallic Synthesis and Magnetic Properties |
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| Authors: | Arnaud Glaria Dr. Myrtil L. Kahn Dr. Pierre Lecante Dr. Bernard Barbara Dr. Bruno Chaudret Dr. |
| Affiliation: | 1. Laboratoire de Chimie de Coordination, UPR8241 CNRS, 205 route de Narbonne, 31077 Toulouse Cedex (France), Fax: (+33)?561‐553‐003;2. Centre d'Elaboration des Matériaux et d'Etudes Structurales, CNRS, 29 rue Jeanne Marvig, BP 4347, 31055 Toulouse Cedex (France);3. Institut Louis Néel, CNRS, 25 Av. des martyrs, BP 166, 38042 Grenoble Cedex 09 (France) |
| Abstract: | Non‐stoichiometric wüstite particles (Fe1?yO) are synthesized using the controlled room‐temperature hydrolysis of the organometallic precursor {Fe[N(SiMe3)2]2}. Particles stabilized by hexadecylamine with a diameter of ～5 nm are obtained. For such small nanoparticles, a distorted crystallographic structure is evidenced by wide‐angle X‐ray scattering at room temperature and reported for the first time. The study of the magnetic properties indicates that these particles are composed of an antiferromagnetic core surrounded by a ferromagnetic shell. According to the Néel theory, we demonstrate that this shell consists of 1.5 % of Fe3+ ions ferromagnetically coupled with Fe2+ ions. |
| Keywords: | iron oxide magnetic properties nanoparticles nonstoichiometric compounds organometallic chemistry |