Formation and processing of mesoporous barium titanate powders via the micelle template method
| Autor: | Ren-Jay Lin, Tsai-Huei Liao, Syh-Yuh Cheng, Chien-Hung Kuo, Hong-Wen Wang |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering Inorganic chemistry Sintering chemistry.chemical_element Barium Condensed Matter Physics Micelle law.invention Barium hydroxide chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials law Barium titanate General Materials Science Calcination Mesoporous material |
| Zdroj: | Journal of Materials Research. 21:941-946 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.2006.0131 |
| Popis: | Mesoporous barium titanate powders having a 100- to 300-nm size were prepared by hydration and condensation of titanium tetra-isopropoxide and barium precursors in the presence of an organic surfactant, tetradecylamine, which was used as a self-assembly micelle. The processing and sintering of these mesoporous barium titanate powders has been investigated. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy were used to identify the structural characteristics and morphologies of the powders. Mesoporous wormhole-like powders with surface areas around 53 ∼ 108 m2/g could be obtained after removing the micelle organics by calcination at 400 °C for 3 h. Powders derived using barium hydroxide were found to form a larger pore size and a higher surface area. The addition of acetic acid was also effective in increasing the surface area. A formation mechanism for the mesoporous structure is depicted. Heat treatment caused the mesoporous spheres to shrink, and 155- ∼ 330-nm grain sizes were readily obtained after pressureless sintering at 900 ∼ 1000 °C for 1 h in air. |
| Databáze: | OpenAIRE |
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