Effect of La substitution on Electrical Properties of Highly Oriented Bi4Ti3O12 Films Prepared by Metalorganic Chemical Vapor Deposition
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概要
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The effect of La substitution on the electrical properties of Bi4Ti3O12 was investigated by using epitaxially grown Bi4Ti3O12 (BIT) films and highly oriented (Bi3.25La0.75)Ti3O12 [BLT] films with (001)-, (118)- and (104)(014)-orientations. By characterizing the leakage current density for films with different orientations, it was found that the leakage current density along the $a$–$b$ plane was decreased by La substitution. The spontaneous polarization ($P_{\text{s}}$) of the BLT film evaluated from the $P$–$E$ hysteresis properties of the (001)- and (118)-oriented films was 3.5 and 38 $\mu$C/cm2 along the $c$-axis and the $a$-axis, respectively. They were smaller than those of the BIT films: 4.0 and 50 $\mu$C/cm2. Based on the fact that La preferentially substitutes for the Bi site in the pseudoperovskite layer, the large remanent polarization widely reported for polycrystalline (Bi3.25La0.75)Ti3O12 films is related to the reduction of the number of defect complexes in the pseudoperovskite layer that possibly pin the domain motion.
- 2003-01-15
著者
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SAITO Keisuke
Application Laboratory
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Osada Minoru
Presto Japan Science And Technology Corporation (jst)
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Sakai Tomohiro
Department Of Innovative And Engineered Materials Interdisciplinary Graduate School Of Science And E
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Watanabe Takayuki
Department Of Biochemistry School Of Dentistry Hokkaido University
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Funakubo Hiroshi
Department of Innovative and Engineered Material, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Osada Minoru
PRESTO, Japan Science and Technology Corporation (JST), 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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