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http://dx.doi.org/10.4191/KCERS.2006.43.4.242

Fabrication of α-Alumina Nanopowders by Thermal Decomposition of Ammonium Aluminum Carbonate Hydroxide (AACH)  

O, Yong-Taeg (Department of Advanced Materials Engineering, Chosun University)
Shin, Dong-Chan (Department of Advanced Materials Engineering, Chosun University)
Kim, Sang-Woo (Nano-Materials Research Center, Korea Institute of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.4, 2006 , pp. 242-246 More about this Journal
Abstract
[ ${\alpha}-Al_2O_3$ ] 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, $8^{\circ}C$, and the highest $[NH_4{^+}][AlO(OH)_n{(SO_4){^-}}_{3-n/2}][HCO_3]$ ionic concentration to pH of the Ammonium Hydrogen Carbonate (AHC) aqueous solution was 10. The phase transformation fem $NH_4Al(SO_4)_2$, rhombohedral $(Al_2(SO_4)_3)$, amorphous-, ${\theta}-,\;{\alpha}-Al_2O_3$ was examined at each temperature according to the AACH. A Time-Temperature-Transformation (TTT) diagram for thermal decomposition in air was determined. Homogeneous, spherical nanopowders with a particle size of 70 nm were obtained by firing the 5 to 8 m crystallites, which had been synthesized from AACH at pH 10 and $8^{\circ}C,\;at\;1150^{\circ}C$ for 3 h in air.
Keywords
Ammonium Aluminum Carbonate Hydroxide (AACH); PH; {\alpha}-Al_2O_3$; Nanopowders; TTT diagram;
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