Mixture of fuels approach for the solution combustion synthesis of LaAlO 3 nanopowders

Abstract

A modified solution combustion approach was used in the preparation of nanosize LaAlO 3 (∼23.6 nm) using mixture of citric acid and oxalic acid as fuels with corresponding metal nitrates. The synthesized and calcined powders were characterized by Fourier transform infra red spectrometry (FTIR), Differential thermal analysis-Thermogravimetry analysis (DTA–TGA), X-ray diffractometry (XRD) and Transmission electron microscopy (TEM). The FTIR spectra show the lower frequency bands at 656 and 442 cm −1corresponds to metal–oxygen bonds (possible La–O and Al–O stretching frequencies) vibrations for the perovskite structure compound. DTA confirms the formation temperature of LaAlO 3 varies between 830–835 °C. XRD results show that mixture of fuels ratio is influential on the crystallite size of the resultant powders. The average particle size of LaAlO 3-1 as determined from TEM was about 41 nm, whereas for LaAlO 3-2 and LaAlO 3-3 samples, particles are seriously aggregated.