Low temperature synthesis of alpha-alumina from aluminum hydroxide hydrothermally synthesized using [Al(C2O4)(x)(OH)(y)] complexes
- Low temperature synthesis of alpha-alumina from aluminum hydroxide hydrothermally synthesized using [Al(C2O4)(x)(OH)(y)] complexes
- 강미숙; 이준성; 박노국; 이태진; 김현수
- SOL; ALPHA-AL2O3; GROWTH; CERAMICS; BOEHMITE; BEHAVIOR; POWDER
- Issue Date
- ELSEVIER SCIENCE SA
- CHEMICAL ENGINEERING JOURNAL, v.230, pp.351 - 360
- This study describes the low temperature synthesis of alpha-alumina from aluminum hydroxide hydrothermally synthesized using [Al(C2O4)(x)(OH)(y)] complexes, in which Al3+ chelated by bidentate oxalate at various molar ratios. Aluminum hydroxide hydrothermally synthesized at 200 degrees C without oxalic acid exhibited a monoclinic boehmite (AlOOH) structure with hexagonal shape. However, adding oxalic acid caused the morphology to change to a spear-shaped boehmite/gibbsite mixed structure. Thermal treatment of the bohemite typed aluminum hydroxide-0 hydrothermally synthesized without oxalic acid produced a rhombohedral alpha-phased alumina with a rice-shaped at above 1200 degrees C. However alpha-alumina was obtained at lower temperature by the bohemite/gibbsite mixture typed aluminum hydroxide-1, -2, and -3 hydrothermally synthesized with oxalic acid. In particular, the aluminum hydroxide-3 having more gibbsite portion hydrothermally synthesized using 3.0 mol of oxalic acid was easily changed to the egg-shaped rhombohedral alpha-alumina at temperatures lower than 900 degrees C. On increasing the oxalic acid concentration, the density of alpha-alumina increased to 1.359 g cm(-3). (C) 2013 Elsevier B.V. All rights reserved.
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