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The synthesis, structural characterization, and magnetic properties of crystalline manganese oxide nanoparticles are presented. The procedure is based on the reaction of benzyl alcohol with the two precursors: potassium permanganate KMnO 4 and manganese(II) acetylacetonate Mn(acac) 2 . Depending on the precursor used, the composition of the final product can be varied in such a way that in the case of KMnO 4 mainly Mn 3 O 4 is formed, whereas Mn(acac) 2 leads predominantly to MnO. Rietveld refinement of the XRD powder patterns, high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and energy-dispersive X-ray (EDX) analysis, as well as electron energy loss spectroscopy (EELS) were employed for the structural characterization of the as-synthesized compounds. Especially the MnO manganosite nanocrystals exhibit some interesting features. HRTEM investigations point to the formation of a superstructure, which can be described as an ordered Mn vacancy cubic superstructure with the general formula of Mn 0.875 O x and a lattice parameter of 8.888 Å. The SQUID measurement proves a superparamagnetic behavior of the MnO nanoparticles.
Djerdj et al. (Sat,) studied this question.
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