Abstract
Micrometer-sized α-Al 2O 3 platelets with hexagonal shape were prepared by thermal decomposition of ammonium aluminum carbonate hydroxide (AACH) using AlF 3 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-Al 2O 3 platelets with the size of 2–3 μm were obtained by calcining AACH at 1200 °C with 5 wt.% AlF 3. The morphology modification is attributed to the various growth rates along different crystal orientations due to the adsorption and uneven distribution of AlF 3. A step growth mode is responsible for the formation of the platelets.
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