Abstract
AbstractWe report on the synthesis of lanthanum manganese oxide (LaMnO3) by solid state reaction using high energy reactive ball milling from manganese oxides (MnO, Mn2O3, MnO2) mixed with lanthanum oxide in stoichiometric ratios. Morphology and particle size of powders were investigated by SEM and laser diffraction at different milling times. A prolonged milling time (>630 min) produces an important reduction in particle size but also powder agglomeration. Structural characterization as a function of milling time was carried out by XRD as well as by TEM for specific samples. Lanthanum manganites were successfully obtained by the simplest possible process, a single step milling at room temperature showing however different transformation kinetics respective to the manganese oxide precursors. Complete reaction of LaMnO3 using Mn2O3 and MnO2 was achieved only after 210 and 270 min of milling, respectively obtaining a mixture of rhombohedral, cubic and orthorhombic phases. From MnO, mainly rhombohedral LaMnO3 could only be obtained after a calcination process. In order to avoid iron contamination, precursor mixtures were milled in nylamid vials with zirconia balls at 360 min for Mn2O3 and MnO2 as precursors. The crystalline structure of the manganites prepared using zirconia/nylamid milling system was mainly cubic. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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