The thermal decomposition of a heteronuclear complex, La[Fe(CN) 6 ] ? 5H 2 O, leads to the preparation of nanosized single-phase perovskite-type LaFeO 3 powders. The microstructural evolution of LaFeO 3 with the temperature has been studied by x-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The product of the decomposition at 500 ± C consists of nanoporous grains which have the morphology of the complex, but diffracting as a monocrystal of LaFeO 3 . At the higher temperatures, the nanosized particles start to separate from each other, still keeping the shape of the complex grains and forming soft agglomerates. The formation of LaFeO 3 from the complex at low temperatures is facilitated by the formation of an orthorhombic transition phase.
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