Abstract
Pure LaAlO 3 nanoparticles were synthesized, using a citrate-precursor technique. La(NO 3) 3, Al(NO 3) 3, and C 3H 4(OH)(COOH) 3, in a molar ratio of 1:1:4.5, were dissolved in deionized water. The pH of the aqueous solution was adjusted using NH 4OH. After drying, the citrate precursors were charred at 350 °C, followed by calcination at different temperatures. The thermochemical behavior of the charred citrate precursor to form LaAlO 3 was investigated using X-ray diffractometry, infrared spectroscopy, thermogravimetric analysis, and differential thermal analysis. While the charred specimen obtained at pH=2 (without NH 4OH addition) was composed of LaAl(OOCH 2) 3, the charred specimens obtained at pH>2 were composed of LaAlO 3− x−y (CO 3) x (OH) 2 y . All these metallic salts were decomposed at temperatures between 600 and 780 °C to form crystalline LaAlO 3 but calcining the specimens in air at ⩾800 °C were required to remove all residual chars to produce pure LaAlO 3. At 900 °C, the citrate-derived particles obtained at pH>2 were composed of LaAlO 3 crystallites with an average size of ∼30 nm.
Published Version
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