Abstract
Pure LaAlO 3 powder was prepared by a combustion synthesis processing using a concentrated solution of nitrates of lanthanum and aluminate as oxidiser, and glycine acid as fuel, with the aim of obtaining nanosized crystallites of this material with high specific area at relatively low temperature. Precursor powders and calcined powders were characterized by differential thermal analysis (DTA), thermogravimetry analysis (TG), X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The results demonstrate that pure perovskite LaAlO 3 powder formed at 700 °C for 2 h and the particle size ranges 78–100 nm. The specimen sintered at 1500 °C for 12 h shows the maximum bulk density and gave the best microwave dielectric properties: ɛ r = 23 and Q f = 38,000 GHz.
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