Polyol synthesis and magnetic study of Mn3O4 nanocrystals of tunable size |
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Authors: | Lorette Sicard,Jean-Marc Le Meins,Fré dé ric Herbst |
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Affiliation: | a ITODYS (UMR 7086), Université Paris-Diderot, Bâtiment Lavoisier, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France b Ecole Nationale Supérieure de Chimie de Mulhouse, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France c Laboratoire de Réactivité des Surfaces (UMR 7609), Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 05, France |
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Abstract: | Nanosized manganese oxide particles were prepared by the so-called polyol process. The average diameter of the particles was controlled by the growth time. X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photon spectroscopy (XPS) show that the particles are well crystallized, pure, stoichiometric Mn3O4 single crystals of uniform size ranging from about 5 to 12 nm. The variation of their dc-magnetization, M, as a function of the magnetic field, H, and temperature, T, clearly corresponds to ferromagnetic ordering at low temperature, with a Curie temperature slightly higher than 40 K. The evidence for superparamagnetism in these particles, due to their very small size, has been discussed in the light of their M(H) and M(T) for zero-field-cooled (ZFC) and field-cooled (FC) plots. |
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Keywords: | Hausmannite Nanoparticle Polyol Magnetic property |
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