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Effect of Content of Mg(NO3)2·6H2O on Fabrication of α-Alumina Nanopowders by Thermal Decomposition of Ammonium Aluminum Carbonate (AACH)

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An α-Al2O3 and MgAl2O3 spinel phase doped α-Al2O3 nanopowders were fabricated by the thermal decomposition and synthetic of ammonium aluminum carbonate hydroxide (AACH). Crystallite size of 5 to 8 nm were fabricated when reaction temperature of AACH was low, 8 °C, and the highest [NH+4][AlO(OH)2][HCO3] ionic concentration of pH 10 from the ammonium hydrogen carbonate (AHC) aqueous solution. The phase transformation of amorphous-s, -, α-Al2O3, MgAl2O3 spinel phases was examined at each temperature according to the amount of Mg(NO3)2·6H2O and AACH. A time–temperature–transformation (TTT) diagram for thermal decomposition in air was determined. Homogeneous, spherical α-Al2O3 nanopowders with a particle size of 60 nm were obtained by firing the crystallites, which had been synthesized from AACH at pH 10 and 8 °C, at 1050 °C for 6 h in air.
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Keywords: AMMONIUM ALUMINUM CARBONATE; MG(NO3)2.6H2O; NANOPOWDER; PH; PHASE TRANSFORMATION; TTT DIAGRAM

Document Type: Research Article

Publication date: 2011-02-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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