Rapid synthesis of perovskite-type LaFeO_3 nanoparticles by microwave-assisted decomposition of bimetallic La[Fe(CN)_6] centre dot 5H_2O compound

摘要

Nano-sized and pure single-phase perovskite-type LaFeO_3 powders were synthesized within a very short reaction time of 4min via the decomposition of bimetallic La[Fe(CN)_6] centre dot 5H_2O compound using microwave irradiation (2.45 GHz, 900 W) in the presence of SiC as an efficient chemically inert secondary heater to initiate the reaction. Product was characterized by XRD, FT-IR, SEM, TEM, BET surface area measurement and UV-vis spectroscopy. In comparison with the well-known thermal decomposition of La[Fe(CN)_6] centre dot 5H_2O, the present method is rapid, clean and energy efficient and resulted in finer particles with higher specific surface areas. The preparation process can be also applied to synthesize other mixed oxides such as SmFeO_3, NdFeO_3 and GdFeO_3.