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Citation: Guo Hui-Fen, Zhang Xing-Tang, Liu Bing, Li Yun-Cai, Huang Ya-Bin, Du Zu-Liang. Preparation of Nanometer-sized BaTiO₃ Crystallites by Sol-gel Method and Size Effects on Structure[J]. Acta Physico-Chimica Sinica, ;2004, 20(02): 164-168. doi: 10.3866/PKU.WHXB20040211 shu

Preparation of Nanometer-sized BaTiO₃ Crystallites by Sol-gel Method and Size Effects on Structure

1.
Key Laboratory of Special Functional Materials, Henan University, Kaifeng　475001;Basic Scientific Department, Jiaozuo University, Jiaozuo　454151

Received Date: 7 August 2003
Available Online: 15 February 2004

Nanometer-sized BaTiO3 crystallites in different sizes have been prepared by sol-gel method. The crystal structure, phase transition and Raman spectra of the BaTiO3 crystallites were investigated by XRD, Raman spectra and DSC. The results indicated that BaTiO3 crystallite forms at temperature of 750 ℃. The average grain size is about 38 nm and the crystal structure belongs to the cubic paraelectric phase. With the increase of annealing temperature, the grain becomes larger and a axis becomes shorter while c axis becomes longer gradually. The crystal structure begins to change to the cubic paraelectric phase from the tetra nal phase at about 54 nm of average grain. The crystal structure of BaTiO3 crystallite with an average grain size of about 102 nm belongs to tetra nal phase. During the decrease of average grain size, the temperature of phase transition from orthodoxy to tetra nal increases while the temperature of phase transition from tetra nal to cubic decreases. There exists heat stagnation in phase transition and the heat stagnation decreases gradually with the decreasing grain size. The frequencies of Raman bands strongly depend on grain sizes and structures of the BaTiO3 crystallite. The characteristic peaks of tetra nal phase disappear at about 38 nm of average grain.
- BaTiO₃;Size effects;XRD;Phase transition
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Preparation of Nanometer-sized BaTiO3 Crystallites by Sol-gel Method and Size Effects on Structure

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通讯作者: 陈斌, bchen63@163.com

Preparation of Nanometer-sized BaTiO₃ Crystallites by Sol-gel Method and Size Effects on Structure