Synthesis of MnFe2O4 nanoparticles by mechanochemical reaction
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The influence of long-term milling of a mixture of MnCO3 and alpha-Fe2O3, and of MnO2 and alpha-Fe2O3 powders in a planetary ball mill on the reaction synthesis of nanosized MnFe2O4 ferrites was studied. The mechano-chemical reaction leading to formation of the MnFe2O4 spinel phase was followed by X-ray diffraction. The spinel phase was first observed after 10 h of milling and its formation was completed after 20 h in case of the MnCO3 - alpha-Fe2O3 mixture. The synthesized MnFe2O4 ferrite has a nanocrystalline structure with a crystallite size of about 28 nm. The thermal treatment of the as-milled powder at 400 degrees C for 4 h led to formation of the MnFe2O4 crystalline phase in case of the mixture of MnCO3 and alpha-Fe2O3, but in MnO2 alpha-Fe2O3 case thermal treatment at temperatures of 400 degrees C and higher leads to formation of (Mn,Fe)203 and separation of Mn2O3 and Fe2O3.
Keywords:manganese ferrite / nanocrystalline materials / mechano-synthesis
Source:Journal of Optoelectronics and Advanced Materials, 2006, 8, 1, 312-314
- Natl Inst Optoelectronics, Bucharest-Magurele