Preparation of micrometer-sized α-Al2O3 platelets by thermal decomposition of AACH |
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Authors: | Wei-Li Wang Yong-Qiu Qi Zheng Xing Dong Guo Yu-Jun Bai |
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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 |
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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. |
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Keywords: | α-Al2O3 platelets AACH Scanning electron microscopy Growth steps |
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