Pure nanocrystalline LaAlO3 powders were synthesized by W/O microemulsion consisting of water, Tween-80 (surfactant), n-Hexyl alcohol (cosurfactant), and cyclohexane (oil). Precursor hydroxides were precipitated in the aqueous cores of W/O microemulsions and then separated and calcined to obtain nanocrystalline LaAlO3 powder. The decomposition behavior of the precursors hydroxides were studied by thermogravimetry analysis (TGA). The precursor hydroxides were calcined at different temperatures and the phase evolution was studied by X-ray powder diffraction (XRD). And the morphology of LaAlO3 powder was studied by transmission electron microscopy (TEM). The crystallite size was less than 50 nm and the shape of the particle is approximately spherical.
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