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Preparation and Characterization of Nano Ferrites

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Lazarević Z., Jovalekić Č., Milutinović A., Romčević M., Romčević N.
Acta Physica Polonica A
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2012
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vol. 121
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issue 3
682-686
EN
Nickel ferrite (NiFe_2O_4) and manganese ferrite (MnFe_2O_4) have been prepared by a soft mechanochemical route from mixture of (1) Ni(OH)_2 and α-Fe_2O_3 and (2) Mn(OH)_2 and α-Fe_2O_3 powders in a planetary ball mill. The mixture was activated for varying duration. Soft mechanochemical reaction leading to formation of the NiFe_2O_4 and MnFe_2O_4 spinel phases were followed by X-ray diffraction, Raman and infrared spectroscopy, scanning and transmission microscopy. The spinel phase formation was first observed after 4 h of milling (case 1) and after 3 h (case 2) and its formation was completed after 25 h in both cases. The synthesized NiFe_2O_4 and MnFe_2O_4 ferrites have a nanocrystalline structure with a crystallite size of about 30 and 40 nm for cases (1) and (2), respectively. There are five Raman and four IR active modes. In order to understand better the whole process of phase formation, the Mössbauer measurements were done.
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