Abstract
Structure, state, transformations and interactions of iron oxide shell with the iron metallic core in aerosol Fe nano-particles has been studied by X-ray and electron diffraction, TEM, Mössbauer spectroscopy and magnetization measurements. A strong influence of the state of nanoparticles oxide shell has been revealed on their magnetization, coercive force and hysteresis loop shift. A long-term passivation of the particles has been shown to be caused by the primary amorphous oxide. The passivation ability of the oxide shell becomes essentially worse after heat treatment of powder, resulting in its crystallization. Basing on the obtained results, a qualitative mechanism of passivation for nanoparticles covered with amorphous oxide shell has been suggested.
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Shafranovsky, E., Petrov, Y.I. Aerosol Fe Nanoparticles with the Passivating Oxide Shell. Journal of Nanoparticle Research 6, 71–90 (2004). https://doi.org/10.1023/B:NANO.0000023226.53516.b6
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DOI: https://doi.org/10.1023/B:NANO.0000023226.53516.b6