Electrophoretic Deposition of Ferroelectric Barium Titanate Thick Films and Their Dielectric Properties |
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Authors: | Masaharu Nagai Kimihiro Yamashita Takao Umegaki Yasuhisa Takuma |
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Affiliation: | Department of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University, Tokyo 192–03 Japan |
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Abstract: | Barium titanate thick films 10–70 μm thick were obtained using a unique electrophoretic deposition technique, which utilizes a mixed ethanol–acetylacetone suspension as the dispersive medium. The capacitance of the BaTiO3 films was measured as 25–70 nF, at temperatures of up to 200°C, giving a dielectric constant of 4000–12000 and dielectric loss (tan δ) of 0.13–0.51. In the sintered films thus deposited, (111) orientation was observed, and the degree of orientation was found to increase with decrease of the thickness of the films. In so-oriented films, the Curie point was confirmed to be near 120°C. |
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