Fe(1-y)O Nanoparticles: Organometallic Synthesis and Magnetic Properties.
Fe(1-y)O Nanoparticles: Organometallic Synthesis and Magnetic Properties.
Non-stoichiometric wüstite particles (Fe(1-) (y)O) are synthesized using the controlled room-temperature hydrolysis of the organometallic precursor {Fe[N(SiMe(3))(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 Fe(3+) ions ferromagnetically coupled with Fe(2+) ions.
Glaria A, Kahn ML, Lecante P, Barbara B, Chaudret B.
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