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Formation and processing of mesoporous barium titanate powders via the micelle template method

Published online by Cambridge University Press:  01 April 2006

Hong-Wen Wang ,
Chien-Hung Kuo ,
Tsai-Huei Liao ,
Ren-Jay Lin  and
Syh-Yuh Cheng
Hong-Wen Wang*
Affiliation:
Department of Chemistry, Chung-Yuan Christian University, Chungli 320, Taiwan, Republic of China
Chien-Hung Kuo
Affiliation:
Department of Chemistry, Chung-Yuan Christian University, Chungli 320, Taiwan, Republic of China
Tsai-Huei Liao
Affiliation:
Department of Chemistry, Chung-Yuan Christian University, Chungli 320, Taiwan, Republic of China
Ren-Jay Lin
Affiliation:
Materials Research Laboratories, Industrial Technology Research Institute, Chu-Tung,Hsinchu 300, Taiwan, Republic of China
Syh-Yuh Cheng
Affiliation:
Materials Research Laboratories, Industrial Technology Research Institute, Chu-Tung,Hsinchu 300, Taiwan, Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

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.

Keywords

Chemical synthesisNanostructurePowder processing
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 4 , April 2006 , pp. 941 - 946
Copyright
Copyright © Materials Research Society 2006

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