Dielectric Properties of BaTiO3 Thin Films Prepared by Laser Ablation
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概要
- 論文の詳細を見る
To study the minimum particle size for a ferroelectric material at which ferroelectricity is retained, thin films composed of stoichiometric BaTiO3 nanoparticles were prepared by laser ablation of a Ba–Ti–O ceramic target using a differential mobility analyzer. Highly densified films of various uniform grain sizes were obtained after post-annealing at 600, 700, 800, and 900 °C in an oxygen atmosphere. The dielectric constants of the post-annealed films varied from 100 to 300, depending on the grain size from 65 to 136 nm. These values are comparable to those of BaTiO3 nano-granular films fabricated by metallorganic decomposition or the sol-crystal method. From the capacitance vs bias-voltage relationship and its hysteresis observed for the post-annealed films, it became clear that a phase transformation from paraelectric to ferroelectric occurs at a grain size of approximately 76 nm. It was also clarified from piezoresponse images of the post-annealed films obtained using a scanning probe microscope that ferroelectricity emerges in BaTiO3 nano-size grains at a grain size of approximately 55 nm.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2006-10-15
著者
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Fujita Junya
Department Of Surgery Ii Osaka University Medical School
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Suzuki Keigo
Murata Manufacturing Co. Ltd.
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Takeuchi Kazuo
Riken
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Sakabe Yukio
Murata Manufacturing Co. Ltd.
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Wada Nobuyuki
Murata Manufacturing Co. Ltd.
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Ohki Yoshimichi
Department Of Electrical Electronic And Computer Engineering Waseda University
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Takeuchi Kazuo
RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Suzuki Keigo
Murata Manufacturing Co., Ltd., 1-10-1 Higashi-kotari, Nagaokakyo, Kyoto 617-8555, Japan
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Wada Nobuyuki
Murata Manufacturing Co., Ltd., 1-10-1 Higashi-Kotari, Nagaokakyo, Kyoto 617-8555, Japan
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Ohki Yoshimichi
Department of Electrical Engineering and Bioscience, Waseda University, Shinjuku, Tokyo 169-8555, Japan
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Sakabe Yukio
Murata Manufacturing Co., Ltd., 1-10-1 Higashi-Kotari, Nagaokakyo, Kyoto 617-8555, Japan
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Fujita Junya
Department of Electrical Engineering and Bioscience, Waseda University, Shinjuku, Tokyo 169-8555, Japan
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