Rapid crystal phase transformation into hexagonally shaped alpha-alumina using AlF3 seeds
- Rapid crystal phase transformation into hexagonally shaped alpha-alumina using AlF3 seeds
- 강미숙; 김현수
- LOW-TEMPERATURE SYNTHESIS; BAYER PROCESS; CRYSTALLIZATION; ALPHA-AL2O3; CERAMICS; HYDROXIDE; BEHAVIOR; POWDERS
- Issue Date
- JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, v.68, no.1, pp.110 - 120
- This study focused on synthesizing highly crystalline alpha-Al2O3 at low temperatures. We found that when a small amount of hexagonal structured aluminum fluoride seeds (AlF3) were added to aluminum precursors, the crystal phase transformation temperature required to form alpha-Al2O3 were considerably lowered and the produced alpha-Al2O3 particles showed hexagonal shapes. Furthermore, when 2.0 mol% of hexagonal structured-AlF3 particles were added as seed to sol-solutions containing various aluminum precursors such as AIP, AlCl3, Al(NO3)(3) or AlOOH, rhombohedral alpha-Al2O3 particles were formed at 750 A degrees C regardless of the use of alumina precursors. Scanning electron microscopy photos showed the alpha-Al2O3 particles produced had hexagonal shapes, and that the morphologies of these particles depended on the primitive structures of the AlF3 seeds added. Based on the relationship between alpha-Al2O3 crystallites sizes and calcination temperatures, crystal growth in alpha-Al2O3 structure was enhanced by adding AlF3 seeds.
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