Synthesis of α-Alumina Hexagonal Platelets Using a Mixture of Boehmite and Potassium Sulfate |
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| Authors: | Hsing-I Hsiang Tsung-Hao Chen Chia-Che Chuang |
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| Affiliation: | Department of Resources Engineering, Particulate Materials Research Center, National Cheng Kung University, Tainan 701, Taiwan |
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| Abstract: | Single-crystal α-alumina (Al2O3) hexagonal platelets with a diameter of about 200 nm and 25 nm in thickness were synthesized by heating a mixture of boehmite and potassium sulfate at 1000°C for 2 h and washing with water. The potassium sulfate addition effects on the Al2O3 phase and morphology were investigated using differential thermal analysis (DTA), X-ray diffraction (XRD), and transmission electron microscopy (TEM). It was found that potassium sulfate addition helps in the formation of single-crystal α-Al2O3 hexagonal platelets and promotes phase transformation from intermediate γ-Al2O3 to α-Al2O3. |
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