Abstract
AbstractNano‐crystalline LaFeO3 was synthesized by a sol–gel auto‐combustion method from a mixed aqueous solution of lanthanum and iron nitride, using citric acid as the fuel. Powder X‐ray diffraction and TG/DTA analysis show that the LaFeO3 crystallites can be directly obtained by the sol–gel combustion process, without any other undesired phase. The results of SEM and TEM reveal that the as‐burnt samples and powder calcined at 700 °C are agglomerated with particle size in the range of 25–50 nm and 60–80 nm, respecitvely. The M (T) and M (H) curves measurements show the existence of a weak ferromagnetism and the mainly anti‐ferromagnetic ordering of the spins in the calcined sample. Compared with the powder calcined at 600 °C and 700 °C, the as‐burnt LaFeO3 exhibits much stronger ferromagnetic behavior, with larger magnetization and smaller coercive field. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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