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Preparation of micrometer-sized α-Al2O3 platelets by thermal decomposition of AACH
Authors:Wei-Li Wang  Yong-Qiu Qi  Zheng Xing  Dong Guo  Yu-Jun Bai
Affiliation:a Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, P.R. China
b Laiwu Advanced Technical School, Laiwu 271100, Shandong Province, P.R. China
Abstract:Micrometer-sized α-Al2O3 platelets with hexagonal shape were prepared by thermal decomposition of ammonium aluminum carbonate hydroxide (AACH) using AlF3 as an additive. The precursor and the calcined product were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy and differential scanning calorimetry. The α-Al2O3 platelets with the size of 2-3 μm were obtained by calcining AACH at 1200 °C with 5 wt.% AlF3. The morphology modification is attributed to the various growth rates along different crystal orientations due to the adsorption and uneven distribution of AlF3. A step growth mode is responsible for the formation of the platelets.
Keywords:α-Al2O3 platelets  AACH  Scanning electron microscopy  Growth steps
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