Effect of Content of Mg(NO3)2·6H2O on Fabrication of α-Alumina Nanopowders by Thermal Decomposition of Ammonium Aluminum Carbonate (AACH)
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][HCO−3] 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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Document Type: Research Article
Publication date: 2011-02-01
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