Self-propagating rapid synthesis and characterization of LaCrO3 powder

Lanthanum chromite (LaCrO 3 ) is a promising functional material because of its high melting point, high thermal conductivity and excellent fire resistance. In this study, LaCrO 3 was successfully prepared by self-propagating high-temperature synthesis (SHS) method using CrO 3 and Cr as the oxidant and reductant. The optimum mole ratio of La 2 O 3 , Cr and CrO 3 was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The result shows that the LaCrO 3 powder with acceptable purity and good morphology was obtained when Cr and CrO 3 are 10% excess over La 2 O 3 . The real temperature of SHS system reaction was recorded by paperless recorder. The particle size distribution of the SHS prepared LaCrO 3 powder demonstrates median diameter of 1040 nm according to laser particle size spectrometer.