Synthesis of thin alpha alumina platelets with a large aspect ratio
| Autor: | Z.Y. Gao, Zhaoping Hou, Biao Zhang, Haijiao Zhang, Yang Wang, Feng Ye, Wen Wang, Qiang Liu |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Morphology (linguistics) Materials science Aspect ratio Process Chemistry and Technology 02 engineering and technology Raw material 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Magazine Chemical engineering law 0103 physical sciences Materials Chemistry Ceramics and Composites Calcination Molten salt 0210 nano-technology Science technology and society Eutectic system |
| Zdroj: | Ceramics International. 47:252-259 |
| ISSN: | 0272-8842 |
| Popis: | Since α-Al2O3 platelets with small thickness and large aspect ratio are needed in various applications, it is of great importance to control their morphology. In the present work, we successfully fabricated α-Al2O3 platelets with small average thickness below 100 nm and large average aspect ratio above 100 by molten-salt method, using Al2(SO4)3 as the raw material, eutectic mixtures of Na2SO4 and K2SO4 as the molten salt as well as TiO2 and SiO2 as the co-dopants. The effects of calcination temperature, seeds amount and seeds morphology on the final morphology of α-Al2O3 platelets were investigated. The growth mechanism of the α-Al2O3 platelets in molten salt was also discussed. A new growth mechanism of α-Al2O3 platelets in molten salt has been proposed, which is different from previous mechanism but can explain the two different phenomena caused by seeds with different sizes and quantity. |
| Databáze: | OpenAIRE |
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