Three unconventional synthesis methods have been successfully applied for the preparation of a-Al₂O₃ powders as follows: thermal decomposition of the complex combination resulted from the oxidation reaction of 1,2-ethanediol by the aluminum nitrate; the solution combustion synthesis based on the exothermal redox reaction of the aluminum nitrate with urea as fuel, respectively acid catalyzed sol-gel method using aluminum triisopropylate precursor. The synthesis temperature, purity and morphology of the prepared alumina powders are highly affected by the used synthesis method. Nanocrystalline a-Alumina were obtained at 500°C by heating aluminum nitrate and an organic fuel, at 1000°C using the decomposition of complex combination method and also at 1000°C using sol-gel method. The formation of   a-alumina phase was investigated by X-ray diffraction (XRD) studies.

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