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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 5    October 2008

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Synthesis of tetragonal BaTiO3 film on Ti substrate by micro-arc oxidation
PENG Ji-hua(彭继华), LI Wen-fang(李文芳), HAN Bing(韩 冰), HUANG Fang-liang(黄芳亮), DU Jun(杜 军)

School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

Abstract:BaTiO3 films on Ti substrate were fabricated by alternative current(AC) and direct current(DC) micro arc oxidation (MAO). Microstructures of films were investigated by means of SEM, XRD and TEM. The results show that the amorphous phase and primitive cubic phase are the main phases in the films prepared by AC MAO. Even after being annealed at 1 200 ℃ for 8 h, only a few tetragonal phases can be observed in films prepared by AC MAO. However, tetragonal BaTiO3 phase can be produced by DC MAO directly. In the films prepared by DC MAO, a mixture of cubic phase and tetragonal phase is formed. After sparking spacious distribution, sparking duration and temperature gradient near sparking sites were taken into account, and a mechanism of synthesis of tetragonal BaTiO3 phase by DC MAO was proposed.

 

Key words: micro-arc oxidation; peroskite; thin film; barium titanate; microstructure

ISSN 1672-7029
CN 43-1423/U

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